Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

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

The quirky gift from West Berlin for the 1968 World's Fair still stands in Hemisfair Park.

Atlanta's strange assortment of concrete pillars inspires reflection in some, confusion in others.

The final resting place of many of Germany's most famous communists.

Ordinary art transforms to extraordinary thanks to locals' quirky sense of humor.

An exact replica of a colossal Olmec head sits atop a pyramid within a Madrid traffic circle.

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

At just 25 inches at its narrowest point, it's one of the tightest streets in the world.

The unedited photograph called "Bliss" has graced the screens of over a billion computers.

Find out what it sounds like when doves cry at Prince's recording studio estate turned museum.

A giant light 13 feet high shines near Thomas Edison's old Menlo Park lab.

A colorful narrow alley in Cuba is full of street art and sculptures made of found objects.

The R&B singer's modest church guarantees a religious experience, regardless of your beliefs.

The dramatic upward-curving roof is one of the most iconic examples of Googie architecture that still stands today.

This Birdsill Holly fire hydrant is the remnant of a very different type of hydration innovation.

A meow-velous tribute to a beloved street cat, made famous on the internet.

Frank Lloyd Wright died a year before construction on his largest public project even began.

A giant toy jack made of numerous welded-together fire hydrants.

This striking icon of the disputed Republic of Artsakh caused a stir at a Eurovision Song Contest.

A tiny, forgotten park of surrealist sculptures in Angouleme.

Crushed coral and crystals give the sand its signature coloration.

This terrifying glass bridge on the side of a mountain cracks as you step on it.

Things aren't quite what they seem at this mind-bending museum.