This is one really big nut.

A motel dedicated to Southwestern nostalgia.

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

Upside-down trees serve as natural flower pots in this hanging garden of Alaska.

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

Nursery with extensive collection of flesh-eating plants operated by the author of "The Savage Garden."

The sprawling, eccentric estate of Ames and Ames, a brilliant botanist, and a genius inventor and artist.

An abandoned horticulture institute gloomily presides over rows of derelict and vine-wrought greenhouses.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

San Francisco's newly reopened hands-on science museum.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

A collection of huge Pre-Colombian structures in Alabama.

The legend of a local monster still haunts this small town.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

Walk the whole Mississippi River!

This structure among the trees was the result of divine inspiration.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

Home to drunken tower-climbing goats... seriously.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

This Tennessee manse was built so opulent that the very utilities doomed it to fail.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

Pennsylvania's own Roswell-style UFO mystery.