This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

The real life town from the Pied Piper of Hamelin has a mechanical puppet show that retells the famous story many times a day.

This German fountain of a legendary apple wine-loving drink thief will spit on you.

A little sculpture with a large wardrobe.

Theme park featuring miniature replicas of European monuments.

Climb inside an iron crystal magnified 165 billion times its normal size.

A beer pipeline runs beneath Bruges.

Deliberately hidden for centuries, the magnificent Saadian Tombs were eventually uncovered in 1917.

Morocco's Argania trees are infested with nut-hungry goats.

Ancient Egyptian relief, claimed to depict an electrical light.

One of its engravings is believed to be among the first representations of medical and surgical instruments.

The largest known Ancient Egyptian obelisk.

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.

This ancient structure is widely thought to be the oldest intact pyramid in the world.

One of the most well-preserved temples of ancient Egypt.

Ozymandias’ time-keeping temple.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

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

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

The history and future of cannabis.