Every equinox this Maya pyramid puts on a spooky ancient light show.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Tiny castle in the middle of the Rhine made you pay to pass.

World's largest Christmas store.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

Macabre astrological automaton clock dating to the late 1400s.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

This replica of the Greek structure is in the heart of Nashville.

The Habsburgs' royal collections of art and wonders.

Op-art architecture designed for happiness.

The topiary maze at the Habsburg hunting lodge.

The most visited, and possibly most controversial, museum in Germany.

Cold war icon and onetime "hole" in the iron curtain.

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

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

The prototype for all Nazi concentration camps.

Executed in 1401, Exhumed in 1878, Stolen in 2010.

Budapest's Communist-era statues, banished to the suburbs.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

A fitting attraction for the corn capital of the world.

A multi-storied adobe complex has been inhabited for more than a thousand years.