The birthplace of Appalachia's only first lady, who some have dubbed the United States' "first female president."

An eight-sided home built during a brief octagon craze in the 1850s.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

Instead of becoming a power plant, this abandoned complex became a massive letdown.

The highest point in Mississippi is a hilltop that was once used to bombard a nearby town with artillery.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

This southwest-styled home in Santa Fe claims to be the oldest house in America thanks to an ancient bit of foundation.

Life-sized sculpture of a blue whale made of hand-recycled plastic trash.

Legends surround this jagged rock formation in the New Mexico desert.

The old Route 66 town straddling Texas and New Mexico died along with the Main Street of America.

A clear blue swimming hole with hidden caves, still unexplored.

A multi-storied adobe complex has been inhabited for more than a thousand years.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

The mosaic floor of a 4th-century synagogue features a pagan zodiac wheel alongside traditional images of a Torah ark and menorahs.

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

An ancient underground cultic temple where sunlight penetrates on the summer solstice.

A modern-day cabinet of curiosities housed in a 300-year-old inn.

Tel Aviv's popular neighborhood went though endless waves of transformation.

A 2,000-year-old wine press hidden in an overlooked park in Tel Aviv.

This clock is an architectural flourish that stands out as a landmark among a unique Israeli German community.

This historic rec center in the heart of Israel is a bastion of peace and togetherness.

The only quarter of the Old City not dedicated to a major world religion.

A "miracle" that seems to produce more holy fistfights than holy revelations.