Walk the whole Mississippi River!

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

An oversized metal construction of Billy Tripp's moods going through life.

Roadside collection of 65,000 signs.

Named after the German word for "a longingness to travel," this park brings together thousands of city and street signs from around the world.

A 30-acre garden inspired by the principles of modern physics.

The fantastic architectural models of a French traveler.

More than 450 years ago, an Italian nun became the first woman to paint the iconic subject.

Twelve plaster figures inspired by da Vinci's famed painting haunt the desert landscape above a real-life ghost town.

A painting in the historic Cathedral Basilica depicts Jesus and his disciples dining on a traditional Peruvian menu.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

Modern art meets modern convenience in possibly the world's most architecturally important public bathroom.

This folk art wall claims to be the world's one and only memorial to the bygone age of hippies.

A 56-foot tall statue of the god of fire looks out over Birmingham, Alabama.

This museum dedicated to an oft-overlooked support industry features a surprisingly moving brass diorama of a man being saved from a sinking car.

This downtown Dallas art installation is always on the lookout.

At the right time of day, sunlight floods through the roof of this cave and illuminates the small pavilion hidden within.

Seattle's super-sized cowboy apparel once belonged to a themed gas station that wrangled in herds of tourists.

A brewery warehouse which doubles as a circus bigtop.

The tech giant built three enormous glass orbs in Seattle so employees could work inside a rainforest greenhouse.

This semi-secret garden in south Seattle emulates a traditional Japanese garden using the plants of the Pacific Northwest.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

A 100-year-old purveyor of curiosities, curios, and kitsch featuring mummies, shrunken heads, and a Fiji Mermaid.

This Seattle joint serves food inside an old train car once used by FDR.