Etched into a dry lake bed, this massive directional indicator is accurate without magnets.

Take a drunken tour inside the world's largest known geode.

The second-largest (of only two in the world) large particle collider is the underdog of experimental physics.

America's first federal monument.

A giant donut stands as a popular symbol of Los Angeles iconography.

The final resting place of a space program monolith, soon to be unveiled again to the public.

A world-class observatory in the California desert.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

A hand-built folk art installation covered with messages of God's love.

A historic Montreal market that was the city's agricultural hub for over century.

Largest Roman Catholic church in North America.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

Oldest existing wire suspension bridge in the United States.

Red frames showcase remnants of one of New York's original subway stations.

Named the fifth most beautiful building in America in 1885, this former courthouse boasts the best view in the Village.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

The miraculous hydrant that saved the Mission District in 1906.

The rusting remains are visible sticking out of the waters of the Delaware Bay.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

Ancient serpentine sacrifice holder that has stood the test of time.

Artifacts of whaling, with both its perils and adventure, are housed in this museum in a former candle factory.

The longest continuous underwater road in North America was built at the insistence of Franklin Roosevelt.

Lehigh Valley barge No. 79 still gets tugged along - but now it houses a museum and unusual performances.

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.