This abandoned church languishing for decades is now one man's passion project and subject of paranormal investigators.

An overgrown garden stands as a grim marker of an unrealized dream.

A massive trilithon nicknamed "Stonehenge of the Pacific."

A magical oasis in the middle of the Negev Desert.

A more chill but no less fascinating version of the famous ancient archeological site.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

Groups of prehistoric tombs that dot the mountains of northern Oman.

The best-preserved beehive tombs in Oman with spectacular backdrop.

This mysterious artificial cave has long puzzled New Englanders.

A decaying garage hidden amid the dense forest is all that remains of a once-prosperous dairy farm.

This Virginia railway overpass is said to be haunted by a serial killer in a rabbit costume.

One of the last active volcanoes on the Eastern seaboard.

This labyrinthine resting place of Black American leaders has been reclaimed by nature.

This ghost town was once a cult-like religious utopian settlement.

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

Nearly 40 miles and 1,000 years of limestone mines under Denmark.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

Iron Age "bog person" preserved for over 2,300 years.

A natural wonder in south Denmark.

Preserved "bog person" that is over 2,000 years old.

A small Richmond island dotted with the remnants of hundreds of years of history.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.