Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

Its buzzing collection honors vibrator history.

This artificial archipelago was supposed to resemble a map of the world.

This futuristic building is yet another architectural wonder in Dubai.

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."

Portlandia is the second-largest copper repoussé statue in the United States.

10,000 flowered plants bloom in the City of Roses.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

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

A triumphant marble and bronze fountain depicting a 15th-century Hungarian king and his hunting party.

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

This statue pays tribute to the iconic musician in the place where he recorded his final studio album.

Swiss vineyards in a UNESCO heritage site.

A constellation of golden cobblestones shows the names of local children born under a full moon.

Florentine Renaissance style building in Switzerland, home to the world's largest taxidermy Great White Shark.

The oldest surviving wooden bridge over Rhine lets travelers cross easily from Switzerland to Liechtensten.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

Throughout this shopping mall are medieval ruins that were discovered during the mall's construction.

One of the oldest, well-preserved water treatment facilities in all of Europe.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

Nine bronze hands protruding from a wall honor the student uprising that led to the fall of Czechoslovakia's Communist government.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

A pair of mutilated bronze octopuses slump at the base of the monument honoring California's admission to the U.S.

The first AIDS memorial chapel in San Francisco and one of only a few in the U.S.