The ruins of an open-air theater built on this Georgia island in the 1970s.

An abandoned guano-mining city in the South Pacific.

This historic hotel has hosted the likes of Babe Ruth, Jimmy Carter, and the Vanderbilts.

The world's largest fully steerable radio telescope.

Visit a replica of the estate where Aaron Burr allegedly plotted a treasonous scheme against the United States.

A saloon and inn that served the Wild West's most iconic figures—and is still haunted by some of them today.

This haunted hotel built on natural springs once served as a hospital for a quack doctor promising a cure for cancer.

An early-19th-century hotel with a past that is steeped in the Civil War.

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

This bizarre hotel on historic Route 66 has been plagued by rumors of paranormal activity.

In the middle of a remote desert town is a surprisingly opulent hotel.

At the most northwestern point of the contiguous United States lies a trail leading through an ancient forest to stunning cliff-side vistas and massive oceanside caves.

This tomb was fashioned with a sliding window for a grieving mother who struggled with her daughter's death.

The final resting place of the most famous outlaw in the Old West.

Three witches are said to be buried beneath these unmarked concrete graves.

Arguably the best example of an authentic Dutch windmill in the United States, rivaling its counterparts in the Netherlands.

This cemetery is all that remains of a school for "wayward" girls.

A hidden grotto on the grounds of the Kane County Government Center.

A replica viking ship from the Chicago World's Fair is still in dry dock in an Illinois park.

This carved armchair marks the final resting place for two pals in the Chicago suburbs.

This stately Victorian-era burial ground overlooking the Pacific Ocean is home to the graves of some of British Columbia's most famous figures.

One of the few places where you can visit a cenote and Maya ruins at the same time.

Home to an endangered salamander, a full moon celebration, and a large spring-fed outdoor swimming pool.

These azure waters were thought to lead to the Mayan Underworld.