Experience the pivotal Civil War battle at this interactive museum.

A labor of love built by local hang-gliding enthusiasts, this ideal launch spot was outlawed by the authorities and has since been largely abandoned.

The forest has reclaimed nearly everything—streets included—from this failed Pennsylvania "City of Heaven" that was once deeded directly to God.

This sculpture brings optical illusion to the roadway.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

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

No one knows the origin of this creepy little stone man with an oversized phallus.

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

Dedicated to a synagogue that was destroyed after having survived World War II.

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

An unconventional memorial to the women burned as witches in Bratislava.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

The beautiful baroque library of the Hapsburg empire.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

Baroque celebration of the end of the Great Plague of Vienna.

Legends surround an ancient tree trunk riddled with nails for good luck.

A spherical "micro-nation" in the heart of Vienna.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

A park where the Inn and Ilz rivers join the Danube as it slinks off into Austria.

Shimmering sea-colored mosaics and Jesus statues cover this opulent building.

When a medieval fire claimed the original St. Stephen’s Cathedral, it sparked a pattern of unquenchable organ building.