These markers are used to document elevation changes around the famed dam.

A little sculpture with a large wardrobe.

The fairy tale castle of the "fairy-tale king."

The prototype for all Nazi concentration camps.

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

A multiversal transit station located right below a highway interchange.

A stunning Victorian abbey and walled garden on a lakefront.

An Irish town has built a statue to a silent film actor simply thanks to the holidays he once spent there.

A proud bronze billy stands as an eternal symbol of Ireland's oldest festival, where a goat is made king.

Four, 18-foot-tall badminton shuttlecocks lie scattered about the lawn of a Kansas City museum.

A propulsion engine testbed that paved the way for the Space Shuttle launch sits without recognition at this rocket center.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

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

After the Cuban Revolution, the famous rum company had to leave their swanky headquarters behind.

Once a favorite playground for the world's most illustrious guests, Hotel Nacional's secret weapons and bunkers reveal a more menacing side to its golden history.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

A Cuban artist reclaimed his impoverished neighborhood as a dreamy folk art kingdom.

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

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

According to tradition this is the oldest church in Venice, but its actual age is a mystery.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Go inside to really appreciate this 500-year-old technological masterpiece.

Amsterdam's Red Light District leaves little to the imagination.