"Holy Wisdom" overlooks the city that became its namesake.

A vast Communist-era exhibition space in the Bulgarian capital.

A striking symbol of the Bulgarian capital.

Sofia's legislative center is continuously reinventing itself.

A sculpture of the beloved author surrounded by characters from his fairy tales.

According to the local legend, these boys and ducks were turned to stone by an angered water goblin.

The inverted pyramid design of this station stands out amid Bratislava's urban landscape.

The largest fountain in Bratislava.

A sculpture of a beloved local figure, who tipped his top hat to everyone he passed on the streets of Bratislava.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

An ode to a soldier who came to town, fell in love, then began making his own sparkling wine.

Launched by Napoleon's soldiers more than 200 years ago, a cannonball remains embedded in the tower wall.

In an area known in Bratislava’s postal history, this sculpture sits equipped with a functional postbox.

This residential door allows San Francisco muggles a glimpse at the wizarding world.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The highest bridge in America was built for an almost unnervingly small amount of money.

This razorback ridgeline has doubled as a scenic drive since the early 1900s.

The largest self-built castle in the U.S., six decades in the making.

This three-mile concrete levee in Pueblo, Colorado was transformed into the world’s longest painting.

Ride aboard a centuries-year-old steam engine and explore dozens of trains parts, including an unusual "comboose."

This unassuming oasis elevated just above the busy streets of Jerusalem offers one of the best views of the Old City.

A collection of haunted objects and macabre oddities under one roof.

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.