Remnants of a storybook amusement park hidden behind a strip mall.

A local farm's collection of unusual structures from a now defunct storybook amusement park.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

A benevolent, 16-foot-tall river dragon lives on a suburban lawn.

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

360° views of the city plus five floors of optical illusions and hands-on science.

The fountain marks the area where hundreds of accused witches were burned at the stake.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

The final resting place of soldiers' loyal canine companions.

A statue in the heart of Edinburgh honors a bear that served in the Polish military during World War II.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

A succession of eerily contemplative iron figures lead from a Scottish museum to the sea.

This series of Scottish caves has no clear purpose other than baffling historians.

A 16th-century Andalusian palace.

The final resting place of the great navigator, or maybe his brother.

This former charity hospital for elderly clergy houses some of Seville’s most treasured paintings.

The world's largest wooden structure.

A subterranean shelter remains intact under a busy Paris railway station.

Indents in the pavement are all that remain from a grisly death machine in Paris.

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.