The half-finished remains of what would have been Scotland’s biggest piece of landscape art.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

A psychedelic labyrinth on the San Francisco bay.

North America's largest accredited model railroad museum.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

A once-thriving hotel in the Swiss Alps couldn't compete with climate change.

A Swiss amusement park entirely dedicated to the theory of ancient astronauts.

A historic observatory precariously perched at the "Top of Europe."

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

This disused Cold War bunker has been restored to all of its early 60s glory.

The largest wooden building in the world now houses a fascinating collection of aircraft.

Another of California's unused Cold War missile defense complexes has become a graffiti gallery.

The graffiti-covered remnants of a former triangulation station are balanced precariously on this California peak.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

An enormous concrete structure built over a nuclear crater.