This is Biete Giorgis, one of eleven rock-hewn churches carved into the volcanic hills of northern Ethiopia over 800 years ago...
Ethiopia was the second ever place to formally adopt Christianity.
Armenia was the first to make Christianity its state religion, in 314, but the Kingdom of Aksum soon followed in 330, and the Ethiopian Orthodox Church was born.
As recorded on the 4th century Ezana Stone.
The Kingdom of Aksum was a large and powerful state which occupied much of Ethiopia, along with parts of what are now Eritrea, Djibouti, and Sudan.
Christianity had arrived via contact with Graeco-Roman Egypt, and Aksum played a key role in the trade and politics of the region.
It was under King Kaleb that the kingdom reached its largest extent. The Byzantine Emperor Justin I asked him to invade the Himyarite Kingdom in the Arabian Peninsula to end the persecution of Christians there.
In 525 Kaleb achieved this, and Aksum dominated the Red Sea.
By the 7th century the Kingdom of Aksum faced serious trouble, at first because of wars with Persia and then because of the Islamic conquests, which spread from Arabia right across to West Africa.
Christian Ethiopia became isolated and fell into decline.
Around the year 900 a new power emerged - the Zagwe Dynasty, which ruled in northern Ethiopia until Yekuno Amlak overthew it in 1270 and established the Solomic Dynasty, which lasted until 1974.
The most famous Zagwe king was Gebre Meskel, who ruled from 1181-1221.
After the Islamic conquest of Jerusalem under Saladin in 1187 - retaking it from the Crusaders - Christian pilgrimage there became much more difficult.
And so Gebre Meskel had a vision in which St George instructed him to build a new Jerusalem in his own kingdom...
And that's exactly what he did.
The local river was renamed the River Jordan and Gebre Meskel had eleven churches carved into the volcanic hills around Lalibela, the capital of the Zagwe kingdom.
It was a new Jerusalem for the pilgrims of his isolated Christian state.
The eleven churches - each of which has a unique design - are in two main groups, one to represent earthly Jerusalem and the other to represent heavenly Jerusalem.
Starting with those north of the River Jordan, there is Biete Medhani Alem (House of the Saviour of the World), which is believed to be the largest rock-cut church in the world.
And Biete Mariam (House of Mary), the interior of which is decorated with colourful frescoes.
And Biete Maskal (House of the Cross).
And Biete Denagel (House of Virgins).
And Biete Golgotha Mikael (House of Golgotha Mikael), which includes replicas of the tombs of Adam and of Jesus, and the interior of which is decorated with carvings of saints.
Then, to the south of the river, is Biete Amanuel (House of Emmanuel).
And Biete Qeddus Mercoreus (House of St. Mercoreos), a grotto church filled with paintings.
And Biete Abba Libanos (House of Abbot Libanos).
And Biete Gabriel Raphael (House of Gabriel Raphael).
And Biete Lehem (House of Holy Bread).
And apart from both groups, connected by a trench, is Bete Giorgos (House of George), famous for its cruciform shape.
These churches took 24 years to build - that's what a Portuguese embassy were told in 1520.
And, like all rock-hewn structures, they were made by hollowing out and shaping existing material rather than adding it.
This was building in reverse.
And so their striking interiors, complete with aisles and arcades and pilasters and columns - like any ordinary church - were sculpted rather than built up.
These places aren't just underground - they are part of the ground.
Also meaning that they were built below ground-level, either standing independently in pits or carved like caves into the hills, all connected by a network of tunnels and trenches.
The rock-hewn churches of Lalibela - a new Jerusalem - are surely no less remarkable now than they were when first built by King Gebre Meskel 800 years ago.
They remain a site of pilgrimage and daily worship, and tell the story of a unique and understudied chapter in history.
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If one thing sums up the 21st century it's got to be all these default profile pictures.
You've seen them literally thousands of times, but they're completely generic and interchangeable.
Future historians will use them to symbolise our current era, and here's why...
To understand what any society truly believed, and how they felt about humankind, you need to look at what they created rather than what they said.
Just as actions instead of words reveal who a person really is, art always tells you what a society was actually like.
And this is particularly true of how they depicted human beings — how we portray ourselves.
That the Pharaohs were of supreme power, and were worshipped as gods far above ordinary people, is made obvious by the sheer size and abundance of the statues made in their name:
It's over 500 years old and the perfect example of a strange architectural style known as "Brick Gothic".
But, more importantly, it's a lesson in how imagination can transform the way our world looks...
Vilnius has one of the world's best-preserved Medieval old towns.
It's a UNESCO World Heritage Site, filled with winding streets and architectural gems from across the ages.
A testament to the wealth, grandeur, and sophistication of the Polish-Lithuanian Commonwealth.
Among its many treasures is the Church of St Anne, built from 1495 to 1500 under the Duke of Lithuania and (later) King of Poland, Alexander I Jagiellon.
It's not particularly big — a single nave without aisles — but St Anne's makes up for size with its fantastical brickwork.
The Spanish edition of my new book, El Tutor Cultural, is now available for pre-order.
It'll be released on 22 October — and you can get it at the link in my bio.
To celebrate, here are the 10 best things I've written about Spain: from why Barcelona looks the way it does to one of the world's most underrated modern architects, from the truth about Pablo Picasso to the origins of the Spanish football badge...
What makes Barcelona such a beautiful city? It wasn't an accident — this is the story of how the modern, beloved Barcelona was consciously created:
When Vincent van Gogh started painting he didn't use any bright colours — so what happened?
It isn't just about art.
This is a story about how we're all changed by the things we consume, the places we go, and the people we choose to spend time with...
The year is 1881.
A 27 year old former teacher and missionary from the Netherlands called Vincent van Gogh decides to try and become a full-time artist, after being encouraged by his brother Theo.
What does he paint? The peasants of the countryside where his parents lived.
Vincent van Gogh's early work is unrecognisably different from the vibrant painter now beloved around the world.
Why?
Many reasons, though one of the most important is that he had been influenced by his cousin, the Realist painter Anton Mauve, who painted like this: