These carved medieval "mercy seats" are among the finest in the world.

There's a labyrinth of medieval chambers hidden deep below a 15th-century pub.

When it came to designing his own small office building, the eccentric architect wasn't afraid to show the world what he could do.

A labyrinthine underworld of tunnels and caverns hides beneath the city.

The oldest inn in England served brew to the crusaders.

A late 18th-century jail.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

A popular European tradition makes its way to the states on one of America's most famous bridges.

Don't blink or you'll miss it.

Temporary Burning Man sculpture made of two 18-wheelers.

An exotic wildlife habitat right off The Strip.

A blacklight mini-golf fever dream pays tribute to the iconic rock band.

A collection of haunted objects and macabre oddities under one roof.

Mysterious meeting place for UFO hunters near Area 51.

This sign designates the road that leads to the infamous Area 51.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

The alleged birthplace of Lady Jane Grey, who was executed at age 16 for claiming the throne of England.

This bare, bronze lad in a lone sock sits in the middle of Loughborough’s town center.

In an arboretum with hundreds of memorials to the fallen, this one might be the most poignant.

This old village lock-up is known as the "round house," but it is actually octagonal.

The longest stone bridge in England has an impressive history that dates back over 700 years.

This early 19th-century blast furnace only survived because it was a financial and technical failure.