A plaque memorializes the Boston location of one of the largest nightclub fires in history.

Statue commemorating the use of ether in anesthesia.

The Boston square dedicated to the dark poet who was born nearby.

Silverware in the sidewalk outside a grocery store cements this neighborhood’s Italian culinary history.

Years of archaeology, just chillin' by the water cooler.

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

A lush green oasis in the middle of Chicago.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

This 21st century cabinet of curiosities includes dinosaur bones, moon rocks, film memorabilia, and more.

In the 19th century, this was the center of Boston's Black community.

19th-century operating theatre in which the use of ether was first demonstrated - plus, a skeleton and a mummy!

Inside the columbarium, thousands of colorful, high-tech Buddhas guard the ashes of the dead.

Fortified homes of highland warriors that are still in use today.

Much of what constituted mid-century Liverpool now litters a beach outside of town.

The bronze uniforms commemorate the vital role of women during World War II.

One of the world’s largest collections of petroglyphs records 2,000 years of human activity.

A rare surviving Victorian greenhouse designed specifically to house giant water lilies.

The outside of this exposed Moche pyramid is covered with striking colorful adobe friezes.

A museum in the building where Nazi Germany signed its surrender tells the story of World War II from the Soviet perspective.

A 1:2 billion-scale solar system leads visitors into this German university town.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

This Oaxacan town is known for its colorful fantastical creatures hand-carved by local artisans.

Though the original building has been demolished, these massive bronze doors were saved.