When the rain falls, this drain system turns into a musical instrument.

Granny Smiths and Fujis can both be traced back to Kazakhstan, where apples still grow wild.

Various forms of phallic art decorate this hill in commemoration of legendary local tragedy.

An abandoned quarry hides an open-air gallery of huge sculptures, some made from the rubble of 9/11.

The world's second-largest sundial, made entirely out of stone.

Ancient artists in the middle of nowhere.

A group of glacial erratic boulders are improbably balanced on white limestone pedestals.

The train platform where Jews were sent to concentration camps is now preserved as a Holocaust memorial.

In the 1940s, Italian architect Mario Cavallè built a dozen of these round homes in northern Milan.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

A beautiful 1920s tower filled with local hidden gems.

This twice-relocated "Usonian" home is among the smallest built by master architect Frank Lloyd Wright.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

This tiny museum hidden above a restaurant houses thousands of modern and traditional kites.

Composed of scrap metal, a pair of platform-length murals chronicle Japan’s history, from the Big Bang to the development of modern Tokyo.

This sculpture forces visitors to confront their relationship with space.

An allegorical statue of a giant pregnant woman representing justice and truth.

Down the road from where the Wright brothers lifted off is another flight tribute practically hidden from sight in the woods.

During World War II, blimps were a key part of the United States' defense against German U-boats—this building could house a dozen of the armed airships.

Now a public art piece, this curious metal feature originally advertised a tinsmith's services.

Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.