3,000 market stands in five former Zeppelin hangars.

Longest fortress system anywhere in Europe.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

The opulent home that inspired Tintin's Marlinspike Hall and the adventures within.

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

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

For hundreds of years, automatons moving to metallic music have been marking the passage of time.

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

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

This salt marsh in Southern France is as pink as the flamingos that inhabit it.

Ancient paintings known as the "Sistine Chapel of Cave Art."

A 300-kilogram egg sculpture that embodied a neighborhood revival.

A small monument in Lithuania marks the geographic center of Europe—or at least one of the claimants.

A memorial to the murdered Jews of Kaunas.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

The widest natural waterfall in Estonia is a sight to see in all seasons.

This soviet pilot's graveyard is filled with headstones made of airplane fins.

A decommissioned submarine base makes a great space for graffiti art.

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

Mysterious craters may have been home to an ancient cult.

This natural Icelandic fissure allows divers to swim right between two volatile tectonic plates.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

A statue that would be at home in Rome can instead be found in the heart of Norway's oldest city.

This roadside attraction looks like a flying saucer parked atop the tundra.