This building has a giant piercing through one of its corners.

The intricate geometry inside this Baroque-style dome was designed to create "terror of the human soul."

At one of Berlin’s oldest churches, visitors can place mosaic tiles to help restore a medieval mural.

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

A tomb with a window to ensure the interred wasn't buried alive.

The concrete shell of an industry giant remains as a playground for graffiti artists, auto scrappers, and paintball warriors.

It was once the base for a series of domestic terror attacks.

The final residence of an educator, civil rights leader, and presidential advisor was also the first headquarters of the National Council of Negro Women.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

This fertility idol of questionable authenticity inspired an iconic Indiana Jones artifact.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

The school tested mustard gas for the U.S. Army during World War I.

Atop this media building, two hives containing more than 30,000 bees keep the surrounding area vibrant.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

This unique museum cafeteria showcases the history and regional diversity of African American cuisine.

Inspired by a piece of concrete, these three pyramid-shaped buildings have been beloved Indianapolis landmarks for over 50 years.

This Indianapolis landmark offers a secret panoramic view of the city. 

The tea room that pushed the boundaries of adorable straight into... we can't find the words.

This poignant art installation raises awareness of violence against women.

An exclusive waiting room built for the royal family in the 1920s is hidden in Milan’s central station.