A rotting tree in the middle of Seattle doubles as an elaborately-controlled art piece.

The magic's in the hole!

An immersive art experience built by local arts collaborative, Factory Obscura, in the building formerly known as The Womb, a psychedelic arts center founded by the frontman of the Flaming Lips.

This singular art museum in São Paulo is unique inside and out.

One of São Paulo's tight urban intersections has become a haven for graffiti artists ever since a single Batman started the trend.

Museum precariously perched on a massive yellow pillar.

Solitary monument dedicated to the beauty of nature.

A bright little alley in La Boca is a part of tango history.

105-foot wide giant metallic flower blooms anew every day in the heart of Buenos Aires.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

A monumental statue of RCA's mascot now sits atop a historical society roof after a life of moving around.

A museum dedicated to exhibiting remarkable outsider art.

The trials and tribulations of marking Poe's grave.

A daily replay of the experiment that proved the rotation of the Earth.

This elaborate towering structure was once famed for its revolutionary height.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Colorful murals by Jean Cocteau hide within this peaceful London sanctuary.

"We gonna rock down to Electric Avenue, and then we'll take it higher..."

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

The childhood home of Earth's alien chameleon is a humble Brixton flat.

This London plaque marks the spot where David Bowie's famous alien made his debut.

An artistic tribute to the famous singer, just around the corner from where he was born.