An alley way dedicated to graffiti and street art is a constantly changing street gallery.

The massive machine creates cracking displays of indoor lightning.

The site of Paul Revere's historic two lantern warning.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

The first park built over a freeway is a brutalist masterwork.

Dim sum, served in a grand old theater.

A dilapidated dock tells the story of Titanic’s missed arrival.

Three prestigious academic collections come together to create a world-class natural history museum.

Eduardo Kobra’s breathtaking 32,300-square-foot graffiti wall took over Rio’s Olympic Boulevard.

A 125-meter long "tribute to the Brazilian people."

Beautiful public park off the beaten path and away from tourists.

This stunning Brazilian library contains the largest collection of Portuguese texts outside of Portugal itself.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

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

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A semi-scholarly approach to sex.

Locals dubbed it the "Owl Building" because of its bird-like appearance.

The world's tallest statue of an American hero.

This downtown Dallas art installation is always on the lookout.

A trio of colossal statues spread across a Dallas neighborhood chart the emergence of a giant robot born of a locomotive and spilled gin.

Second largest wastewater treatment plant in the country.

The statue of John Harvard isn't actually John Harvard—or even, technically, the founder of the school.