Built in 1981 in collaboration with Andy Warhol, this giant piece of pop art stands on the campus of Colorado State University.

The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.

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

Oddly enough, a pair of Wolfs funded the construction of this Little Red Riding Hood sculpture.

A subterranean display of public art and architecture.

A small square plaque marks a failed assassination attempt that could have changed history.

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

This massive statue is the personification of Bavaria and the first colossal statue of the modern period composed of bronze.

The scars of World War II are preserved on its walls.

Among the ostentatious rococo ornamentation of this church, an image of death cuts the life-thread.

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

A stairway to heaven, or to nowhere at all.

A technicolor place of worship for Elevationists.

Curios, scientific antiques, oddities for sale.

Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.

This deserted Gold Rush town is home to a Masonic lodge that, strangely enough, still holds meetings.

These decaying bridges 1,000 feet high are a reminder of the skill it took to cross the Colorado Rockies by rail.

This museum offers an actual time machine back through Colorado's past.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

Where scientists keep miles of very valuable ice from Antarctica and Greenland from melting.

The clock that sets them all.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.