This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

These numerous Israeli caves were dug out over hundreds years for reasons ranging from hideouts to burial sites.

Neighborhood in Jerusalem is home to the ultra-orthodox haredim.

Descend 2,030 years into the past in an ancient tunnel built to support Jerusalem's most famous wall.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

Amöneburg is a town perched on top of a basalt mountain in the middle of an ancient meteor crater.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

A world-class collection of mechanical musical instruments and automata.

A trompe-l'oeil statue honoring the first guide dog in North America.

This hospital fell into ruins after failing to act as the advocate for the mentally ill it was designed to be.

A historic grist mill and active sluice on the Black River.

A farm in New Jersey grew a most unusual crop for AT&T's testing purposes.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.