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

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

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

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

Tiny communists hammer away on the Olomouc Astronomical Clock.

An ornate plague column – built to celebrate life – claimed the lives of numerous artisans during its construction.

The world's largest reflecting pool is just two centimeters deep.

This Bordeaux parking garage has 712 indoor spaces, and one outdoor.

A massive volcanic plug is now a protected area that hosts a number of bird species.

Legend says these rocks used to be hunting dogs, a story that may have inspired Sherlock Holmes' most famous case.

A open air theatre built on a cliff by an eccentric British woman.

It is said the legendary wizard once lived in this sea cave beneath Tintagel Castle.

A fantastic castle rumored to be the birthplace of King Arthur.

A whimsical cottage from the 1300s with a preserved Victorian-era post office inside.

A circle stone within a stone circle.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

400-year-old garden, restored to beauty.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

A towering tribute to decisiveness stands on the spot where Brigham Young and his followers decided that this must be the place.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

A "miracle" that seems to produce more holy fistfights than holy revelations.