Where Saint-Martin ends and Sint Maarten begins (or vice versa).

A roundabout in the West Indies that pays tribute to a bus driver who brokered no-nonsense on the school route.

This might be the most famous abandoned hotel in the Caribbean.

A nouveau-riche hilltop “palace” that once provided lodging to more than a hundred fishermen.

Scale the heights of this 100-foot play space shaped like a ferocious dragon.

A unique shrine dedicated to the deified skull of a 17th-century Tokyo courtesan.

The decommissioned steam engine’s whistle can still be heard three times a day at one of Japan’s oldest train stations.

Not quite the menace it once was, this monster still has some chops.

Collection of fossils, plants, and ancient animals encased in amber.

An Ottoman-era mosque looking over the Black Sea.

The ruins of a Roman temple from 1st Century BC with the only preserved inscription of “The Deeds of the Divine Augustus.”

The only Roman honorific column in Istanbul.

This Ottoman bridge is a rare covered bridge with shops, and considers itself the only bazaar bridge in the world.

A little-known caravanserai hidden among farmhouses in the Turkish countryside.

This beautiful train graveyard is one of the largest collections of steam locomotives in the Mediterranean and Europe.

It's believed that this small church was connected to the Hagia Sophia via a secret tunnel.

The ancient latrines of the Greeks, in all their public glory.

The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

This former Imperial summer home was the venue for a royal slap that once echoed 'round the world.

Ancient serpentine sacrifice holder that has stood the test of time.

No one is sure if the world's fourth-largest diamond had been found in a rubbish heap or was pawned by Napoleon's mom.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

A fountain standing as a testament to a doomed alliance.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.