Six beautiful wooden giants are hidden around Copenhagen.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

This 16th-century house tells the city's history through old artifacts and quirky tales.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Housing the famous Norwegian ice-defying 19th century polar exploration ship.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

The last bastion of Roman presence north of the Alps looms over a German town.

This abandoned five-star hotel is now a five-star urban exploration destination.

Fortified medieval tower house with lovely roof garden.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

Five candy-colored villages on the Italian Riviera.

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

The only surviving piece of Copenhagen's 16th-century defensive wall.

A museum filled with tiny, adorable versions of the mighty Royal Danish Navy.

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

This sublime architectural marvel is a rare example of an expressionist church.

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

The largest bottled beer collection in the world holds over 22,000 unique beer bottles.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.