What looks like missing grout is actually an old pub's peephole.

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

What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

The gilded, masterful astronomical clock will calculate time, dates, and planetary positions for thousands of years to come.

Moscow's other, lesser known kremlin is a fairytale-like cultural complex modeled after Old Russia.

The remains of the observatory of the Danish astronomer who first measured the speed of light.

This modernist tower was saved by a fraternity with a 500-year-old penchant for shooting at wooden parrots.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

Giant wind turbine with observation deck at the very top.

Danish observation tower designed to look like a giant beer bottle.

This small exhibition displays equipment and artifacts once belonging to the feared Stasi secret police.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

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

A fascinating little museum dedicated to the thousands of chemical substances concealed in our food.

Hamburgers are intensely proud of their tunnel beneath the river.

A chaotic collection of maritime artifacts, art, and really whatever else happens to be around.

A natural wonder in south Denmark.

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

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

Mounds, rune stones, and a 1,000-year-old church, left behind by Denmark's first two kings.

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

Bursting forth from a historic German neighborhood, these day-glo palaces are now a bright fixture in the town.

This German monument honors the so-called "Prince of Mathematicians."

A Nazi concentration camp and Anne Frank's place of death.