A beautiful and abandoned New York subway station from 1904, complete with chandelier.

This Oregon farm is dedicated to teaching people the professional art of tree climbing.

Home to the only outdoor municipal elevator in the United States.

This little slice of the Netherlands in the Pacific Northwest blooms in a rainbow of color each spring.

A makeshift shrine to the late rock star is still kept up on the nondescript façade outside 1 Logan Place.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

This geothermal hot spring hides beneath a slowly growing mineral dome.

Hanging over one of Japan's "hidden valleys," these vine bridges must be remade every three years.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

The largest self-built castle in the U.S., six decades in the making.

The longest hedge maze in the world.

Bioluminescent firefly squid light up this Japanese fishing port.

The world's longest known cave system.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

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

Collapsing castle on the Hudson river was once the storage site of military surplus business.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

Established in the '60s, a family-owned tropical drink bar founded by Ray Buhen, bartender to the stars.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Rebuilt remains of a temple to Roman god Mithras.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.