Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

The walls are decorated with whimsical murals painted by the creator of the Madeline franchise.

Climb a set of vertiginous stone steps to the top of this impressive ancient edifice.

A meow-velous tribute to a beloved street cat, made famous on the internet.

Housed in an old British jail, this spot serves up Georgian, Russian, and Ukrainian specialities with a side of Turkish history.

The legendary luxury train passage is commemorated with a charming museum inside its former eastern terminus.

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.

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.

Large miniature theme park with 100-plus models.

The most metal church of all time was built in record time because of an international, pious pissing contest.

Step back in time and witness the fall of Constantinople.

1513 Turkish world map, full of European state secrets and snarky commentary.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A staircase made of gravestones leads up to this church built into a giant rock.

The nuns here cultivate silk to weave some of the finest scarves in the world.

This church combines Christian, Byzantine, and ancient Greek architectural elements.

An autonomous republic of Orthodox monks.

This tower is all that remains of the mosque that once stood in the center of the city, before it was destroyed by fire in 1941.

The preserved arm of a third-century sorcerer is believed to have the power to lift curses and spells.

The ruins of an abandoned church loom within a picturesque Ukranian village.

When a conglomerate of visionary startups commandeer a disused Greek Orthodox Church, zaniness ensues.

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

Extensive Orthodox icon collection in Andorra.