Mile-long cave system near Great Smoky Mountains.

This 19th-century building inadvertently preserved the handprints of its builders within its walls.

Jule Körner's house full of bizarre architectural details.

A piece of outsider public art accompanied by a strange urban legend.

This vast kitty-themed collection illustrates the history of human-cat interaction.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

A priest with no formal artistic training used basic house paint to create gorgeous religious scenes inside this historic church.

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

The spot where the namesake of the Douglas fir met his mysterious end on a Hawaiian volcano.

This legendary urban waterfall creates a dazzling display of rainbows.

In 2018, Pohoiki Road was severed by lava flowing from the eruption of Kilauea.

A beach made of semi-precious green sand on the Big Island of Hawaiʻi.

This black shoreline is made up of exploded lava particles.

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

Ten acres of the Kula Forest Reserve make up this wondrous state park.

On Waikīkī Beach, a monument to four extraordinary individuals of dual male and female spirits who brought the healing arts from Tahiti to Hawai'i.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

This ruined fort and statue are a testament to the last king of Kaua‘i’s savvy diplomacy skills, which briefly brought Russians to Hawai‘i.

This blowhole is supposedly caused by a trapped monster.

This industrial area was the dumping ground for massive amounts of trash, some of which washes up as tiny bits of sea glass.

This lakeside tower is the third attempt at getting a tourist destination to stick on the spot.

Walk the same tracks that once ferried Gilded Age aristocrats to their vacation destinations.

The house and graveyard used in the Stephen King spine-chiller.

The final resting place of 121 victims of the RMS Titanic, 42 of which may never be identified.