The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

Home to items never before seen by the public.

The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.

See massive fossils that are over 200 million years old in northeastern Arizona.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

Two men built this castle on the Florida coast as an artistic “landscape sculpture.”

A museum dedicated to the history and exploration of both popular music and science fiction.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

The highway's southernmost spot is a beloved local attraction.

A monument celebrating the idea of reaching inaccessible places.

Florida's oldest bar was once a morgue, complete with a hanging tree and gravestones.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

The history and future of cannabis.

2300-year-old Roman road connecting the empire.

An ancient fortification lives on in this Chinese city.

China's most famous acrobatics act.

The once highest point in China blends symbolic design with a kick of adrenaline.

The tiny statues form China's only known terracotta army from the Han dynasty.

The most famous location in China was home to whole dynasties worth of imperial rulers.

Inside a former cabaret, seven floors of erotic art.