Faces carved into the cliffs create an otherworldly walking trail.

Beside a busy highway, a colony of Great Blue Herons raises hundreds of offspring each year.

The aggressively banal name of this underground fortress of bureaucracy does little to evoke its truly surreal existence.

This eerily well-preserved coal town was saved from destruction by a Sean Connery movie.

This small piece of Michigan is entirely surrounded by Ohio.

A throwback train ride transports passengers through one of the lesser-known national parks in the country.

The oldest remaining authentic Putt-Putt course that Donald Clayton created in Ohio.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

This NASA test station is home to some of the world’s largest and most powerful space environment simulation facilities.

Four ionic columns from the Treasury Department building ended up in a park in Nebraska.

Underneath downtown Lincoln resides a network of caves that was also the city's first brewery.

This erect, phallic geological spire wasn't always named so domestically.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

The Hveragerði fissure runs through this unassuming shopping center.

A replica of the decorated wooden pillars Viking sailors threw overboard when finding new places to establish a settlement.

Puffin enthusiasts flock to Europe's largest seabird cliff, which over one million birds call home.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

This New Orleans tree is filled with hidden chimes that produce a carefully tuned melody.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.