Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

In the heart of Tirana, this underground nuclear bunker has been transformed into a museum.

A museum dedicated to secret surveillance.

A mysterious bridge over a sunken Roman road.

An oasis of calm, nestled in the English countryside.

This fairytale inspired, warped building houses restaurants, shops, and a radio station.

A 14th-century Serbian Orthodox church that was once converted into a mosque under the much-disfavored Ottoman Empire.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

This ancient hydrological marvel is now the base of a modern outdoor cinema.

The oldest standing Byzantine church in Athens is tucked within a monastery in the middle of an upscale shopping district.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

When construction began on this hotel, developers were surprised to find the ruins of an ancient civilization.

This Byzantine Church was moved from Paris to Athens block by block.

The ruins of an ancient fortification wall sit in front of and underneath this boutique hotel.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

A Byzantine-era church hidden in a wooded area below the Acropolis.

This historic square in Nepal is home to temples dating back to the third century.

One of the largest Buddhist stupas in the world keeps an eye out in every direction.

Sacred Buddhist home of some spiritual monkeys.

Across this single-file rope bridge is what has been claimed to be the edge of continental Asia.

In the heart of Luxembourg's "little Switzerland" weaves a breathtaking natural sandstone canyon with a mythological past.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

Browse through a century of this principality's first popular export.

Liechtenstein's royal family calls this medieval alpine castle home.