America's first National Historic Landmark is a 100-foot tall obelisk and gravesite dedicated to the only casualty of the Lewis & Clark Expedition.

A stark reminder of the huge nuclear weapons plant that once stood on the site and its effect on the surrounding area.

A downtown park built on top of unclaimed graves.

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

This art shopping center still boasts pieces of its past as a textile factory.

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

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

The final resting spot of the Colorado Transportation Department's beloved unofficial mascot.

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

Macabre astrological automaton clock dating to the late 1400s.

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

The prototype for all Nazi concentration camps.

Go surfing on this urban wave, "hacked" by local surfers.

A fearsome dragon clings to a corner of Munich's city hall.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

From Ancient Rome to WWII, Neupfarrplatz has over 2,000 years of history underneath its main square.

This riverside restaurant has been serving customers since 1146.

Explore some of the most unique vehicles in history along with a cast of unsettling mannequins.

The oldest operating cemetery in Denver is the eternal home of some of the Centennial State's most famous residents.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

An innovative local park built from an abandoned sewage treatment plant.