The last moments of the ill-fated Pompeiians, frozen forever in plaster.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

An alchemist's "magic door" stands in the middle of a Roman park.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

A sycamore tree grown from seeds that traveled to the moon.

A retired firefighter created this contraption so he and his family wouldn't die if accidentally buried alive.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

This extraordinary Depression-era expenditure was modeled after a postcard of a Mediterranean hotel.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

This collection honors the iconic, and proudly American lighter that just won't quit.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

A tunnel that brings more than a century of history to life from the deepest parts of the Niagara Gorge.

A subterranean house of worship carved right out of the bedrock.

The oldest continuously operating pharmacy in Europe.

A medieval setting reimagined into a unique art alley.

Walk along the medieval fortifications that have been protecting Tallinn since the 14th century.

During the Soviet era, the spire of this longstanding church was used as a radio transmission tower.

The Guardian of Tallinn.

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

A winding district gerrymandered into the shape of a mantis.

Walk through the history of American pop culture.