One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

Theme park featuring miniature replicas of European monuments.

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

A little sculpture with a large wardrobe.

Cozy basement bar sports an inventory of over 2,000 beers.

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

Copenhagen's celebrated theme park and gardens.

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

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

A fascinating insight into daily life in the Eastern Bloc.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Where commuters walk through remnants of an ancient Greek necropolis.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A misnamed well, with a deep dark past.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

Possibly the world's largest hourglass only needs to be reset every New Year's Eve.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

This former quarry is now a picturesque gorge that hides a sunken lake.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

A bizarre roadside attraction and the first instance of miniature golf in the world.

Georgia's highest point was given its strange name thanks to a simple translation error.