The fountain marks the area where hundreds of accused witches were burned at the stake.

360° views of the city plus five floors of optical illusions and hands-on science.

This "floating railway" is one of the world's oldest monorail systems.

A German apartment building hosting as many trees as human occupants.

Giant topiary dog once played a role in a terrorist bomb plot.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

World's only telecommunication tower with a wooden pinnacle.

Carved fountains poignantly placed in parks and in front of special monuments.

Fantastic views and thousands of love locks.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

Home to items never before seen by the public.

A hot dog stand where the heads are just as hot as the dogs.

The palatial McDonald's that inspired Wesley Willis.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

Twisted buildings adorn the banks of the Rhine river.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

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

The oldest museum in Russia is home to a fascinating collection of nearly two million anthropological artifacts and anatomical curiosities.

This historical Netherlands fortress still bears the marks of its single siege.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

An ancient tunnel in Jerusalem built to redirect water in the event of a siege is one of history’s great architectural innovations.

This subterranean funicular is one of the world's smallest subways.