The only surviving prototype for Buckminster Fuller's house of the future.

Northern Ireland's Brobdingnagian stepping stones.

A museum marks and documents the site of the Titanic's launch.

The ancient tomb acts as a calendar that keeps perfect time.

Breathtaking and huge 430 year old maps of Italy.

Prone to disastrous fires, the city of San Francisco has the Guardian, a fireboat gifted by residents, to watch over them from the bay.

An enormous artwork that colorfully celebrates over 150 years of US military achievements.

The short oil boom of Venice Beach, and its swift removal from the tourism-laden landscape.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

A unique geological area spiked with wind-carved rocks that resemble teepees.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

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

Pilgrimage site for star-crossed lovers.

A museum dedicated exclusively to aircraft used in the military.