A popular 19th-century natural landmark is now hidden within a sprawling forest.

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

This lonely rock has been turned into a character loved and feared by children.

The grandest stage for the world's foremost masters of invisible instruments.

An incredibly durable timepiece glows beneath shoppers' feet.

The world's second largest salt mine, said to have been discovered by Alexander the Great's horse.

The vaulted ceiling is home to a scurry of “squirrelgoyles.”

A trail of "Game of Thrones"-themed doors carved from fallen trees from the iconic Dark Hedges.

This tiny train shuttles passengers to one of Northern Ireland's most spectacular sights.

One man's ambition created this psychedelic log home.

A forgotten Cold War relic hidden in the outskirts of a Wisconsin city.

This abandoned amusement park was built on a site with a dark history.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

The remains of a deserted 1800s farming community can be found in Little River State Park.

A short hike into the mountainside forest reveals a decaying 1890s town.

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

This crumbling UFO is one of only a few remaining "moveable ski chalets" of its kind.

A key producer of charcoal iron in the early 1800s, the structure still stands today.

Despite being burnt down multiple times, the ruins of this South Carolina church are still standing.

Despite repeated attempts to make it work, this former mining town is now nothing but dust and memories.

The location of Puerto Rico's first water bottling plant, thanks to a collaboration between Mother Nature and technology.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

A haunted hot springs hotel that went from healing retreat to asylum before it was restored.

Tucked away on an empty wooded lot in suburban Oklahoma City lie the remnants of an abandoned circus camp.