The design of this historic domed church was influenced by Thomas Jefferson and intended as a statement of religious freedom.

Bizarre Cavern.

An eerie, decaying ghost town destined to fade into the forest.

This free, take-a-book shop seems like a trick but isn't.

Eighteen miniature death-scene dioramas.

One of the oldest surviving Swedish-American homes in the United States.

This splendid Versailles-inspired mansion has the largest French-style formal gardens in North America.

Enchanting gardens surround a derelict mansion, all hidden in plain sight behind a stone wall.

A blend of art, antiquities, and Americana fill this museum, surrounded by whimsical, enchanting gardens.

One of the oldest Catholic churches in the U.S., situated just east of Gettysburg.

Designed by Horace Trumbauer in 1893, this Gothic-style castle is now a home for academics.

Frank Lloyd Wright built this suburban synagogue late in life, but it stands among his most iconic masterpieces.

The home of possibly the least-loved U.S. president stands as a sort of unpopular Monticello.

An abandoned Jazz Age dream home and con man's hideout in Death Valley.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

The lighthouse central to the 1980s horror classic "The Fog" is, in fact, located in one of the foggiest areas of the Pacific Coast.

Commonly referred to as the most photographed Victorian home in the United States.

Life in this isolated, hilltop lighthouse was lonely, but it sure was lovely.

This hilltop park offers magnificent views and a Frank Lloyd Wright masterpiece.

Golden Gate Park's historic collection of plants.

San Diego's most historic and haunted home.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

The "Fun Spot of the Desert" is now a haunting ruin, and a reminder that putting a water park in a desert is a bad idea.

This massive redwood tree has a hole in the base big enough to drive through.