What else would you call a playground hidden in Alabama's oldest and largest cemetery?

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

This brutalist monument is inscribed with 9921 names of Yugoslav partisans who perished during WWII.

This museum preserves the hand-dug tunnel that kept Sarajevo afloat during the Serbian siege.

This spaceship-like Serbian monument reaches for the stars in celebration of the fallen fighters of fascism.

This collection of unique liquids allows visitors to wander the waters of Iceland's glaciers.

Appropriation-friendly collection of books, periodicals, and more.

Cheap art and political theater in Vermont.

A symbolic graveyard for the villages that perished during the Nazi invasion of Belarus.

World's oldest operating science fiction and fantasy club, once home to Ray Bradbury and L. Ron Hubbard.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

This unusual building straddles two countries.

From lefty Jewish gathering site to hip cultural site in just 80 years.

Display that gathers the basic elements of the universe in one convenient location.

A shape-shifting buy-sell-trade bookstore, born to Beatnik Era spirit.

A tribute to the life and work of the beloved "Peanuts" cartoonist.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

An old town theater converted into a celebration of the hobo legacy.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

This memorial park stands on the site of one of the largest mass executions of the Second World War.

Island of trash twice the size of Texas floats in the Pacific.

The most playful of the life-sized statues that make up Singapore's "People of the River."

A gigantic collection of teeny, tiny books.

An artsy hidden staircase leads to breathtaking views of San Francisco.