Duluth mineral magnates built this charming art deco lodge to be their private clubhouse.

Two flush headstones mark the only known graves to be embedded in an airport runway.

A wonderful and easily overlooked museum tucked in Ohio's Burke Lakefront Airport.

This airfield is home to a number of retired vintage planes in various states of disrepair.

This subterranean funicular is one of the world's smallest subways.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

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

This Hawaiian cattle ranch acts as a museum devoted to the island cowboys that predate the wild west.

Watch the newest land on the planet form before your eyes.

A true treehouse near Hawai'i Volcanoes National Park.

This black shoreline is made up of exploded lava particles.

A beach made of semi-precious green sand on the Big Island of Hawai'i.

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

Race through the maze, get your name on the sign.

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

A tunnel of hardened lava along Maui’s famous Road to Hana.

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

Sculptures of religious figures made from the ashes of pilgrims' incense.

Hidden beneath the streets of London is a secret subway that only carried mail.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

The final resting place of the songwriter who penned “Take Me Out To The Ball Game."

North America's largest accredited model railroad museum.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

The 10-foot-wide Long Beach home was built on a dare.