A perfect circle of twenty-four mysterious holes dates back to prehistoric time.

The longest living non-clonal organisms on Earth.

Europe’s oldest natural human mummy.

Native Americans built this circle of stones, which was used to predict astronomical events.

Stroll through Welsh history in a village of reconstructed structures.

A hidden world of exotic succulents and cacti.

A Roman-inspired temple once controlled half of San Francisco's waters.

Housed in a memorial lighthouse, this museum relays the history of surfing, beginning with the antics of royal Hawaiian teenagers.

Neoclassical Revival mansion and set of horror cult classic Phantasm.

This (occupied) house is 10 feet wide and full of spite.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

This old mining town, deep in the California desert, has a year-round population of one.

On the Oregon coast there is a natural hole that seems to be draining the sea.

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.

The world's largest collection of mechanical puzzles is a cornucopia of analog bafflers.

This sanguine boulevard was named after a deadly cowboy bar fight.

Along the old Route 66 is an abandoned trading post made from old telephone poles, built by a former circus clown.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

The world's largest anatomically accurate brain sculpture.

Ornate limestone building now filled with geologic specimens, and more.

If astronomy had a ghost, it would look like this observatory.

Modeled after the labyrinth in Chartres Cathedral, this small-town Indiana memorial labyrinth sits half a world away.

In an alley not far from where two great highways meet, byways of a very different sort are honored.

A wartime promise becomes a shrine to Our Lady of Lourdes.