This church is dedicated to the patron saint of seafarers.

This building served as the first customs house in modern Greece.

This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

More than 300 years old, Kyoto's historic "teahouse" still operates as an invitation-only geisha club.

A former reservoir that was only recently discovered after more than 60 years of disuse.

These steps offer a breathtaking view of one of Europe's most besieged fortresses.

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

The former headquarters of history's oldest megacorporation.

A New York–based physician returned home to Spain to build his own elaborate monument to Christopher Columbus.

This ducal residence was once home to a future Russian empress and a French king in exile.

A secluded, little-known temple hidden amid the dense jungle.

Nearly three tons of weapons from the Vietnam War still remain in this small, hidden museum.

The man who helped establish the first rules of golf.

Although now a decaying ruin, this stone cabin's history includes several notable figures.

Nature is slowly overtaking this disused cemetery on the outskirts of Brussels.

Also known as the "Red Taj Mahal."

This full-sized orange tree lives suspended in mid-air above the streets of Jaffa.

This controversial statue once honoured a Russian Field Marshall, before ultimately being dismantled in a push to remove symbols of Russian influence.

This Ottoman-era church is hidden amid a busy tourist area.

One of the world's tallest flagpoles.

Once the site of the Hawaiian monarchy, this building was originally designed as a palace.

Perhaps the most spectacular grotto along the Algarve coastline.

Small Easter eggs are hidden in the ventilation holes of the city's newest trains.

Now home to a drinking establishment, this building has a macabre history.