This beautiful Miami garden was designed as a laboratory for tropical plants.

A marvel of Byzantine engineering under the streets of Istanbul.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

Two hundred tons of pioneer artifacts were painstakingly recovered from a shipwreck at the bottom of the Missouri River.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

Trace the history of writing at this unusual North Carolina destination.

Sandstone rock formations that look like they belong on the cover of a progressive rock album.

An absolutely beautiful 200-foot stained glass installation traces the evolution of knowledge.

This amazingly preserved Gold Rush town is a historian's dream.

Mining town from the late 1890s, once home to Calamity Jane.

Home to the deepest rift anywhere on Earth.

One man's ambition created this psychedelic log home.

An architect's childhood fantasy treehouse made real.

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

A beautiful geyser under environmental threat.

14th century Norse artifacts in Northwestern Minnesota could have proved a Viking landing before Columbus.

America's largest viking stands in a Minnesota city that believes it was visited by the ancient nords.

One of the smallest towns in the United States.

One of the world's most definitive collections of musical instruments, spanning all cultures and historical periods.

The ravine where Jesse James supposedly performed an impossible jump to evade capture.

A century-old cabin off of Highway 30 touts an unusual construction material: dinosaur bones.

The last physical evidence of the Lewis and Clark trail is one of their autographs etched into this giant rock.

Devilish landscape, once cinema home to giant alien bugs, now derelict roadside attraction.