This easily overlooked memorial immortalizes the scars from the 1956 Hungarian Revolution.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

Crouch down, stretch tall, and be sure to flail your legs to pay homage to the Monty Python classic.

The 20-mile causeway that separates the Netherlands from the sea.

A Sri Lankan tea factory's ironic take on the Los Angeles landmark.

'The Letters of Utrecht' lays out a ribbon of poetry one letter at a time, with no final verse in sight.

Only the foundation remains of the rest stop building that was hit by three large tsunami waves, killing 47 visitors.

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

This network of tunnels housed an entire village for years, and even had a hall for screening movies.

Ruins of a former government building destroyed during the Georgian-Abkhaz war in the wake of the fall of the Soviet Union.

This cavern was used as a hidden hospital and safe house during the Vietnam War.

A little sculpture with a large wardrobe.

The sister plane of the C-123 shot down during the Iran-Contra Affair has found a new purpose in retirement.

Ha Long Bay's "Cave of Surprises" houses a popular phallic rock formation.

This elaborate temple was built around one of the Buddha's teeth.

Pull up and have a drink at a museum filled with hundreds of years' worth of shipwreck artifacts.

This artificial ring island was built to hold cubic tons of polluted dirt.

Mountain where Jesus was first tempted by the Devil.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Stone memorial that's said to predict the death of the pope and the site of the Cadaver Synod.

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

Walk through a fairytale in Tuscany.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.