A natural wonder in south Denmark.

The greatest amusement park in the world is wall-to-wall farting dogs, puking rats, and cows with exposed breasts for the whole family.

This Scandinavian island is the site of the first modern observatory.

World's strongest whirlpool.

The world's first ice hotel is still one of the most elaborate and beautiful.

This Stockholm light tower can be controlled by anyone with a smartphone.

A subterranean house of worship carved right out of the bedrock.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

A vast, otherworldly collection of Buddhist stupas.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

Wisconsin's most celebrated export gets the royal treatment on I-94.

An unusual round church in London with a Templar past.

This expansive bridge in the Canadian wilderness was originally just built for friends.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

Quite simply the largest tree in the world (by volume).

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

A layered tribute to the work of mosaicist Isaiah Zagar.

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

Furniture tries to escape an abandoned building in San Francisco.

A battle between nature and architecture in the Cambodian jungle.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.