The capital of Cambodia is named after the hill on which this ancient temple complex stands.

More than 100 Hindu temples are slowly being swallowed by the forest.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

The former headquarters of history's oldest megacorporation.

Inspired by "The Starry Night" this Dutch bike path turns into a glowing work of art each night.

A UFO-shaped event building originally intended to be a science museum showcasing the future.

Take a stroll through the hellish grotesques of Hieronymus Bosch in this elaborate Netherlands church.

This neighborhood of futuristic ball houses looks like an alien settlement in a science fiction film.

A historic observatory now an astronomy museum beautifully situated at the moat of the Middle Age city centre.

'The Letters of Utrecht' lays out a ribbon of poetry one letter at a time, with no final verse in sight.

Atop this former dutch railway office sits an interstellar work of art.

This still-celebrated home was a radical architectural experiment in 3D De Stijl.

For years, the remains of this ancient Roman fortress were hidden under an orchard.

Descend into the tunnels to experience the life of a coal miner.

The secret room where early Bolsheviks cranked out propaganda fliers on a smuggled printing press.

This architecturally eclectic fortress witnessed centuries of bloody turmoil, including the massacre of its ruling clan.

Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

Small church on top of a huge rock column.

Rock-hewn monastery complex with hundreds of cave structures tucked away into the mountainside.

Underground monastery and fortress.

Ancient rock-hewn town that witnessed key events of Georgian history.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.