Golden Gate Park's historic collection of plants.

The only ski tunnel in North America provides easy access to amazing snow and beautiful views.

Over thousands of years, this slot canyon was carved out of the bed of an ancient lake.

This unique library spans a mighty river.

A remnant of the last Ice Age, this lake is surrounded by fascinating rock formations.

This lovely tree was a thank you gift from the man known as "Public Enemy No.1."

A historic landmark and museum filled with curious objects representing the history of Key West.

This stone, said to have once been a young woman, is sacred to the Dakota and Lakota nations.

Three playfully immersive mini golf courses let you travel alongside your ball to the cup at this facility, which has been around since the 1950s.

Hundreds of personalized inscribed planks make up this historic boardwalk.

This 24-acre park offers a place for meditation in the midst of Sedona's iconic red rocks.

Jule Körner's house full of bizarre architectural details.

Silver in the hills led to the speedy creation of this boom town and a lack of it saw the town abandoned nearly as quickly.

A train station that was abandoned by the coal industry and was later converted into a cocktail bar.

A museum within a museum, devoted to history's most questionable medical devices.

The origin of this mechanical boy was a mystery until he revealed his maker by writing it in perfect cursive.

The highest point in Virginia can only be reached by passing through ponies and flowers.

The illuminated falls are a gem in North Cascades National Park.

The strange phenomenon causing gravity to "work backwards" on this hill has been blamed on the paranormal.

This might just be the TARDIS of bookstores.

This tiny New Jersey village has lived many lives but seems determined to remain a ghost town.

From pre-war whiskey cocktails to prohibition-era speakeasy secrecy, this bar has seen it all.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.