A marvel of Byzantine engineering under the streets of Istanbul.

Home to what was once considered the largest gate in central Asia.

This "tower of death" has acted as an observatory, a religious hub, and an executioner's lair.

Controversially restored in the 1970s, this giant 15th-century mosque is shrouded in legend.

The Avenue of Mausolea is a series of grand palatial tombs.

An 18-meter-long sarcophagus of a constantly growing dead prophet.

Light still pours into the ruins of this ancient Islamic observatory.

An underground world of gorgeous, palatial metro stations designed as a nuclear shelter complex.

Prowl through this sprawling bazaar under a massive Soviet-era dome for delicious eats.

The Port of Yokohama’s customs headquarters building resembles a Moorish kasbah, complete with a minaret.

Enormous pendulum helps keep Taiwan's tallest building from swaying.

The tallest church in Mechelen might have been the tallest in the world if not for a lack of funds.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

The real life town from the Pied Piper of Hamelin has a mechanical puppet show that retells the famous story many times a day.

The U.S. military dumped millions dollars worth of goods off a beach in Vanuatu, purely to spite the British and French.

This salt lake in South Australia features seasonal color changes and its very own loch monster.

These giant grain silo portraits capture elements of rural life in Australia.

Cooled, fractured lava formed this geometric rock feature.

Enjoy all the trappings from 1912 aboard this Titanic-themed restaurant.

A roadside hotel that you can’t stop at. 

For better or worse, this whimsical sculpture garden was a favorite place of Rupert Murdoch's.

Dedicated to a strange, local cryptid beloved by all.

This area was created to save the region's koala population.