This former maximum-security prison is creepy, sobering, and supposedly haunted.

This winding road of 318 curves is a must-visit for (careful) motorcycle and sports car enthusiasts.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

Pilgrimage site for star-crossed lovers.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Go inside to really appreciate this 500-year-old technological masterpiece.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

One of Ireland's most infamous prisons for rebels including men, women and children.

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

The tallest tower in Cáceres's Old Town.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

Follow the steps, and this roadside artwork will teach you how to dance.

One of the world’s largest and deepest freshwater springs, where mastodons once roamed.

Off of the Crawfordville Highway in Florida, nature is taking back this decrepit row of Ford trucks.

Dothan, Alabama has been invaded by scores of anthropomorphic peanuts.

Monument to the cotton-destroying boll weevil.

What better place to take a seat?

This structure among the trees was the result of divine inspiration.

While knives are the main feature in this store, visitors will also find dinosaur bones and meteorites.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.