Places Elizabeth Montgomery Wants to Go

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

Egyptian Revival movie palace abandoned for decades and restored in 2013.

Located in the world's highest-altitude Dark Sky Community, this observatory welcomes amateur and professional astronomers alike.

It's safe—and permitted—to walk across these twin natural sandstone arches.

The final resting place of one of the United States's greatest poets.

In the middle of a New England forest sit the crumbling ruins of World War II-era ammunition storage bunkers.

Once home to a thriving oil industry, this town now sits eerily abandoned.

An enormous, inside-out glass globe built in 1935.

Colin Stokes "got a bit carried away" and built a castle that looks like something out of Tolkien.

The camera-toting gargoyle juts out from the exterior of a Gothic cathedral.

Part of a highway network meant to connect Miami to Montreal, this 10-mile stretch of road made from red bricks is still around 100 years later.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

An idyllic mineral hot springs facility with a more-than checkered past.

The ghost town that was one of New Hampshire's first settlements now exists as a park detailing its history.

The only surviving prototype for Buckminster Fuller's house of the future.

Over a thousand feet beneath the Detroit streets is a subterranean metropolis few are allowed to enter.

A group of college students hauled a desk up a mountain more than 40 years ago. The notebooks inside have become a makeshift time capsule.

This North African stone complex is considered to be the oldest astronomical observatory on Earth.

Walk down these stairs to get an underwater view of Switzerland's Lake Zug.

The ruins of a resort and casino sit on the banks of this blue hole spring that pumps 70,000 gallons of warm, clear water every minute.

From Vikings to nationwide rebellions, this castle has seen its fair share of warfare.

A puppeteer’s paradise offering shows, workshops, and an archive of over 2,000 puppets.

This bookstore serves recipes from the cookbooks on sale.

One of Scotland's most important modern structures, it just made the '100 Most Endangered Sites' list.