Hikers can still stroll beneath the long conveyer of this abandoned mining facility hidden in a West Virginia river gorge.

It took more than 20 years and a sharp eye for one man to assemble this quirky collection.

This enormous World War II relic is one of the largest wooden structures in the world.

What is it about mushrooms that makes people wish they lived inside of them?

The inventor of the iconic Pringles can was so proud of his invention he was buried in one.

This humble star-gazing center touts itself as the "Birthplace of American Astronomy."

This collection of Japanese luck idols beckons visitors with over 2,000 waving paws.

An obsolete, vanishing traffic device warns Cincinnati drivers away from middle-of-the-road obstructions.

An abandoned relic of the city's failed experiment with below ground transit.

Abandoned since the 1950s, the streetcar lane beneath the heavily trafficked bridge lays empty and unused.

A derelict bit of transportation infrastructure hidden in the woods.

The hidden offices underneath Memorial Bridge have been locked up since 1976.

This forgotten boat elevator was an engineering marvel in its heyday.

One of the last remnants of the Bessemer process that revolutionized steel production during the industrial age.

One of the last doorless, continuously moving elevators still in use in the U.K.

Built to test magnetically levitated elevators, the tower also boasts Germany's highest visitor platform.

A half-size replica of the World Trade Center towers above Tulsa.

The world's largest sticker ball weighs in at a mighty 231 pounds.

A metal ring in the middle of the road marks the exact spot where the Soviet satellite crash-landed in 1962.

A piece of John the Baptist in the American heartland.

The ruins of a 19th century shelter run by the Independent Order of Odd Fellows.

Three markers installed over the course of 140 years mark the point where Arkansas, Missouri, and Oklahoma converge.

Tiny observatory made big contributions to the study of the Earth's motion.