The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

Countless grotesque faces stare out from this eerie Prague art wall.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

Macabre astrological automaton clock dating to the late 1400s.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A marvel of Byzantine engineering under the streets of Istanbul.

High winds can make this one scary landing.

Inside this faux cave, visitors can learn how some of their favorite fantasy characters were created.

New Zealand's only running funicular railway.

The world's only complete colossal squid specimen is on display at the Te Papa Museum.

An abandoned Byzantine fortress and notorious prison.

An ancient Thracian city where fire rituals were practiced on the largest cult altar in Southeast Europe.

An homage to the medieval rulers of Bulgaria.

An abandoned saucer-shaped monument in the Bulgarian mountains.

A magnificent, glittering building tucked into a tiny Bulgarian mountain town.

A mountain pass in Bulgaria's Balkan Mountains was the site of four historic battles.

A spectacular Bulgarian cave resembling a devil's head with a waterfall rushing down its throat.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

A gigantic statue of a Russian soldier watches over the ancient city of Plovdiv, a prominent reminder of the Soviet period in Bulgaria.

This tiny Bulgarian town offers a stunning location in the mountains and a storied history.

Imperial palace of Emperor Galerius, the Emperor behind the worst Christian persecutions during the Roman Empire.

The second-largest Jewish temple in Bulgaria was deserted after World War II, seized by the communist government and then abandoned again.

Bizarrely shaped rock formations in northwest Bulgaria come with equally bizarre legends.

The temple that withstood the Nazis.