A striking symbol of the Bulgarian capital.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

This historic black and white monastery is one of Bulgaria's architectural jewels.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

Once a favorite playground for the world's most illustrious guests, Hotel Nacional's secret weapons and bunkers reveal a more menacing side to its golden history.

Buried in the Laos jungle is a sanctuary for bears that would have otherwise been milked to death by poachers.

This tiered waterfall is so pretty it may cause visitors to cry tears of their own.

This collection of reclaimed landmines acts as both an exhibition of their deadly history and as a shelter for children affected by them.

Hoax, mistake, or evidence of dinosaurs in human times?

A battle between nature and architecture in the Cambodian jungle.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

This statue commemorates the meeting of the most influential minds of the women’s rights movement.

Pluto is still considered a planet in Ithaca, New York.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

The home, museum, and death site of Kodak's influential founder.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

The library of every book lover's dreams.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

The "Seinfeld" diner.

In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.