The tallest hotel in Europe.

A modernist landscape of water and sci-fi concrete.

A building so large that it has its own weather.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

The fastest transatlantic ocean liner sat abandoned in a Philadelphia shipyard for decades.

The Giant Lemon of Lemon Grove.

Lucha Libre (Mexican Wrestling) themed taco shop.

North America's largest accredited model railroad museum.

The second oldest continuously operating bar in Louisiana.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

Ho Chi Minh's perfectly preserved body has been on display here since 1975.

A downtown park built on top of unclaimed graves.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

A tribute to Ponce de Leon's supposed quest for eternal youth.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

World's largest bell sits on the grounds of the Kremlin in Moscow.

Church built on the site where the last tsar of Russia and his family were killed.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

The world's longest known cave system.

Museum dedicated to the terror regimes of Hungary.

The only castle in North America to ever house European sovereigns.

Palace where the nearly un-killable Rasputin was murdered.