A 60-room castle constructed by a horse-racing heir.

Oldest synagogue in the United States.

The second oldest Jewish graveyard in the U.S. is tiny, with connections to George Washington and Henry Wadsworth Longfellow.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

Mysterious stone tower featured in many alternative histories of the New World.

The unbelievably opulent home built for an infamous newspaperman.

The writing studio of an American adventure author, built in the style of a medieval castle.

A classic gold rush hotel can be expected to pick up some ghosts along the way, and the Golden North is no exception.

The king of U.S. high points towers over every other peak on the continent.

This shrine to the patron saint of Alaska sits on a small tidal island and was built from the land’s own beach stones.

A tiny wilderness cemetery commemorates the deadliest episode of the Klondike Gold Rush.

This blowhole is supposedly caused by a trapped monster.

This former luxury resort in Kaua'i is now an abandoned relic.

The southernmost point in the United States is a beautiful place to look at but a deadly place to wade in.

A controversial memorial at the place where Captain Cook met his violent end.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

What remains of the summer palace of King Kamehameha III.

Doris Duke's lasting collection of Islamic Art, hidden in a Hawaiian paradise.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

An authentic replica of an Asian temple and garden hidden amongst the natural beauty of Hawai'i.

A beautifully eclectic mix of architectural styles.

The attic of a four-century-old canal house hides a clandestine church.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.