When the rain falls, this drain system turns into a musical instrument.

America's most famous piece of self-built architecture.

A dormant lightning machine equal to all the power in Russia.

A German apartment building hosting as many trees as human occupants.

A completely underwater art museum sends a stark message about humans' impact on the environment.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

The first museum in the world devoted to sexual gadgetry.

A massive 1830s industrial site once known as Czechia's "Iron Heart" has been transformed into a playground of science, technology, and art.

Centuries-old bridges grown from tangled roots.

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

A Japanese concept restaurant that feels like a party thrown by the monsters in your closet.

Tokyo’s only Vaudeville-cuckoo clock–steampunk-Victorian curio cabinet time piece.

A unique hotel for the artistic soul.

A gargantuan crystal kingdom.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

Singapore's landscaping project is home to 18 incredible Supertrees.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

A lesser-known part of the Kinsey Institute is this impressive collection of art, artifacts, and material culture related to human sexuality.

Lions and tigers and leopards, servals, pumas, bobcats, lynxes, and ocelots... oh my!

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

You might know it as the Overlook Hotel, but the inside is not going to be familiar.