These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.

The oldest surviving synagogue in New York City is now a soaring art space.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

America's only nuclear missile silo open to the public.

These eerie outliers of the lightning bug family glow a mysterious blue color.

In the remote high desert of New Mexico, a strange array of poles beckon fury from above.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

A science teacher's dream.

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

Quite simply the largest tree in the world (by volume).

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

A reproduction of earth's many biomes.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

Mysterious rocks that ring musically when struck.

Stroll through a wonderland of stupendous moss-covered trees.

An enormous, inside-out glass globe built in 1935.