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.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Cold war icon and onetime "hole" in the iron curtain.

One of downtown Berlin's last reminders of its Communist past.

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

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

Guests can stay at a hotel in the former French abbey where lie the tombs of King Henry II and King Richard the Lionheart.

Miles of man-made caves and tunnels are currently used for cultivating mushrooms.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

Historic medieval fortified city in southwest France.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

Pop culture has helped to keep this iconic British building from being destroyed.

This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

A beautiful Greco-Roman structure houses a well once believed to have healing powers.

Village situated on a narrow volcanic escarpment.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

In 1927, a biplane disappeared while attempting to complete the first non-stop transatlantic flight between Paris and New York City. This memorial stands at the last place it was seen.

One of the oldest and largest wooden churches in France was very evidently constructed by shipbuilders.

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.