Nearly 40 miles and 1,000 years of limestone mines under Denmark.

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

An enormous playhouse designed to look like 21 stacked Lego bricks, with another 25 million colorful Legos inside.

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

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

Old Danish castle immortalized in Shakespeare's Hamlet.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

A little-known cafe in an old copper bridge tower with 360-degree views of the harbor.

A natural wonder in south Denmark.

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

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

A walkable map of the world, made from soil and stone by one man.

Six beautiful wooden giants are hidden around Copenhagen.

Hans Christian Andersen for the postmodern world.

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

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

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

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

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

Copenhagen's celebrated theme park and gardens.

The deserted pirate-themed restaurant still entices explorers.

This futuristic observatory at the top of the Pyrénées offers unrivaled views.

A French valley with forests so lush it was nicknamed "the Small Amazonia of the Pyrenees."

This narrow path was cut right into a French mountainside to feed the country's early naval expansion.