Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.

This former coal gasification plant found a curious second life as a popular public park.

A giant Troll lurks under one of Seattle's oldest bridges.

A 100-year-old purveyor of curiosities, curios, and kitsch featuring mummies, shrunken heads, and a Fiji Mermaid.

St. Augustine's record-setting narrow street was designed to protect against pirates.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

A lighthouse on this West Virginia lake started as a joke, then the forces of nature helped make it a reality.

The world's largest fully steerable radio telescope.

This rural community has attracted both scientists and techno-refugees due to its federally-mandated lack of technology.

Home of a 28-foot tall stalagmite known as the War Club.

Take a steam-powered ride straight out of the past on this Appalachian rail line.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

Outsider art meets paleontology at this roadside reptile repository.

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

A genuine Tudor manor transported piece by piece from England.

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

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.

This historic mansion was built as a symbol of love between a husband and wife.

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

Outdoor exhibits explore the contributions of European, African, and indigenous peoples to American frontier culture.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.