A vertically floating hemlock controls the waves and weather at Crater Lake.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

The inventor of a number of hybrid corn species is immortalized with a field of giant corn.

A monument to a Native American leader who was known for never breaking a promise and met his end after signing a deal with white settlers.

Memorials and tributes scattered across the university grounds remember a famous national tragedy of the Nixon era.

The childhood home of one of Ohio's favorite sons, pilot and war hero Eddie Rickenbacker.

An office built to look like a giant basket.

Georges Seurat’s pointillist masterpiece has been recreated in Ohio in topiary form.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

The world's longest known cave system.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

Its buzzing collection honors vibrator history.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

A beautiful geyser under environmental threat.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Elevated freight railway turned wildly successful urban park.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.