In the mountains of West Virginia is this perfectly preserved Art Deco train station.

A cult archaeology conspiracy theory claims these West Virginia petroglyphs were written by Irish monks in Ogham.

A desperate final message left by a POW on the run serves as a memorial for himself and the 97 that died with him.

The innovative Nigerian floating school that may just be a glimpse into the future of design in a world of troubling climate changes.

A curated museum of wooden sculptures inhabits this Russian home.

A series of concentric circles represented a bold new experiment in socialist urban planning, and it notoriously difficult to get around.

A kitschy, creepy St. Louis mainstay.

Speak to a companion on the other side of the room loud and clear through this architectural anomaly.

A chessmaster's dream destination.

An abandoned factory along the Mississippi coated by a giant mural.

Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

A library and museum dedicated to typography.

Radioactivity still cause for concern at this urban explorer's paradise.

A 140-year-old castle with underground caves hidden in San Francisco.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A psychedelic labyrinth on the San Francisco bay.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A huge musical instrument played by the ocean.

A winding path built in secret on the edge of the continent.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

Once the fastest ship from San Francisco to Tahiti, the Galilee now lays in pieces in three different cities.

A modern mechanical planetary system, part of a 10,000 year clock.