Some of the clearest water anywhere in the world.

A mysterious echo seems to defy the laws of acoustics.

A stark reminder of the huge nuclear weapons plant that once stood on the site and its effect on the surrounding area.

High atop a Mexican rainforest mountain, this ancient pyramid once drew pilgrims countries away.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

Twice a day this ancient path disappears with the tides, leaving the Holy Island of Lindisfarne out to sea.

This "Palace of Purification" has made many film appearances as a dark and sinister headquarters.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

A beautiful, creepy 19th-century castle stands incongruous in rural Vermont.

This sandstone mansion was the home of two of Oregon's most important pioneers.

Site of the greatest known waterfall that ever existed.

This expansive bridge in the Canadian wilderness was originally just built for friends.

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

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

An American city stranded at the tip of a Canadian peninsula where strict adherence to the "49th parallel rule" became problematic.

This bridge provides safe passage for squirrels.

This Gothic Revival castle used as a shooting location for "The Secret Garden" and other films.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

This black shoreline is made up of exploded lava particles.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

This lesser known Hearst estate is a fairytale village built from the stolen bones of historic European buildings.

The remains of a former logging boom town, crumbled away in the forest.

Ozymandias’ time-keeping temple.

A castle built for love, and abandoned due to heartbreak.