L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

This sprawling farm was once a Cold War-era hideaway for the nation's top diplomats.

The first statue of Christ sleeping on a bench in the United States confused its affluent parish.

From golden eagles to peregrine falcons, this rehabilitation and education center is a haven for birds of prey.

A year-long seasonal produce clock highlighting a variety of fruits and vegetables from across the Piedmont region.

This scented city oasis was a labor of love.

This nine-story building can be played like an instrument.

This large cave is a summer home to thousands of bats and has a rich history dating back to prehistoric times.

This stone incorrectly marks the 35th parallel, causing some territorial kerfuffles.

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

Large rocks have been painted to whimsically resemble wild and farm animals.

The perfectly named cave drop is the deepest in the continental United States, almost matching the height of Seattle’s Space Needle.

Live long and prosper in Tennessee.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

One architect's organic, human-centric design has been fully realized in this alien art house.

Avant garde house of Pierre Cardin on the Cote d’Azur.

This massive blockhead sculpture hides an entire library.

The construction of a tram line unveiled hidden remnants of the old medieval city.

Artist's eccentric property excessively decorated with found objects and work of his own.

Auguste Maïcon, a pioneer in French aviation, was born in this house in 1891.

A medieval military street hidden beneath a charming French fishing village.

Nearly every wall in this French villa has been "tattooed" by artist Jean Cocteau and other famous painters.