A tunnel with windows, so you don't miss out on the impressive views.

A fiery crater has been burning in the Karakum Desert since 1971.

A rare cluster of alien-like plants grows along a dusty highway.

This statue dedicated to the story of a Flemish boy and his dog was relatively obscure in Belgium, but a cult sensation in Japan.

About as hidden as can be, this specialty coffee shop is wedged between multi-story buildings at the end of a dark, skinny alleyway in Seoul.

Various forms of phallic art decorate this hill in commemoration of legendary local tragedy.

A theme park made of glass, from the gleaming books on the shelves to the crystal fish in the mirror lake.

Natural rock water slides hidden in the remote forests of northern Idaho.

Home to the deepest rift anywhere on Earth.

A six-ton, 12-foot-tall concrete prairie dog is touted as the largest in the world.

Just a man taking his prehistoric pet for a stroll.

A beautiful geyser under environmental threat.

Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

The largest island on the great salt lake is home to curious creatures and strange stories.

This concert pavilion on the shore of the Great Salt Lake has been destroyed by fire, water, and disinterest but keeps coming back.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

This quirky local sculpture is quite literally a fish out of water.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

Bonsai trees that are up to a thousand years old.

An enclosed rotunda at the Henry Art Gallery in which viewers can look up and see the uninterrupted sky.

The illuminated falls are a gem in North Cascades National Park.

A whimsical village of unique treehouses resides in a Washington forest.