The abandoned "Red Star Train Graveyard" is the final rusting place for precious artifacts of train history.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Once the home of a hermetic monk, this cave now houses a small church.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

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

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

The world's first combination ski slope and power plant.

An abandoned lighthouse awaits its destiny: being buried under shifting sand.

Four alabaster giants contemplate the tides on the shore of Denmark.

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

The oldest amusement park in the world has been providing a nice spot to have some fun since the 1500s.

This Danish rock field is actually a sprawling ancient cemetery holding the bodies of 700 Vikings.

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

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

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

Old Danish castle immortalized in Shakespeare's Hamlet.

A natural wonder in south Denmark.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

Hans Christian Andersen for the postmodern world.

Six beautiful wooden giants are hidden around Copenhagen.

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

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