This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This massive library holds what was once the largest book collection in the world.

Abandoned railway line circling the city of Paris.

Notorious artist squat renovated into legal studios.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The world's largest human gathering is held at the confluence of three sacred rivers, one of which is mythical.

This magnificent 18th-century hall consists of a maze of nearly a thousand interconnected passages.

The painted and decorated towers of this Hindu shrine were once the tallest structures in one of the oldest cities in India.

A complex of six forts embedded in the Rajasthan hills.

The remains of what was, not so long ago, the world's largest city.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

Neo-cave art on the macro scale.

A bronze sculpture of Lenin’s likeness outside Havana surrounded by 12 human figures in solidarity with the Bolshevik Revolution.

No one knows the meaning behind this giant sculpture of a nude woman with a fork riding a rooster in Havana.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

A colorful narrow alley in Cuba is full of street art and sculptures made of found objects.

In terms of history and architecture, this is one of the most remarkable cemeteries in the world.

A Spanish-style estate that has traded black ties for rock concerts.

A Cuban artist reclaimed his impoverished neighborhood as a dreamy folk art kingdom.

This subterranean disco dance club in a Cuban cave comes with bright lights and a dark legend.

The skyline of Montreal includes the silhouette of an unexpected fruit-shaped Canadian staple.

The biggest museum dedicated to insects in North America, one of the largest in the world.