A playground inspired by differential calculus dangles from the ceiling of the Liberty Science Center.

Historic Greenpoint theater turned roller disco, then chain pharmacy, and now Sweetgreen.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

Hot Doug's "Hot Dog" Stand.

The palatial McDonald's that inspired Wesley Willis.

Once at the center of U.S. finance, the historic Trading Room was meticulously recreated piece by piece and rebuilt in the Art Institute.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

A store full of vintage and indie toys designed to bring out the kid in even the crustiest of adults.

Spitalfields' regal market goat is said to be a monument to the area's migrant population but most are pretty sure it's just a goat.

Hear the quietest sound from across the dome.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

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

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Walk through the history of American pop culture.

A museum dedicated to exhibiting remarkable outsider art.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

A young botanist's horticultural vision realized through a lifetime of planting, tending, and collecting seeds.

Allowing humans and fish alike to migrate from freshwater to saltwater and back again.

A busy cafe better known for board games than food.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

A drawbridge named for a potentially intersex Polish national who fought alongside George Washington during the American Revolution, and an example of "Pulaski Red".