See massive fossils that are over 200 million years old in northeastern Arizona.

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

Home to the deepest rift anywhere on Earth.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

A beautiful geyser under environmental threat.

The only road through the heart of Glacier National Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

The last physical evidence of the Lewis and Clark trail is one of their autographs etched into this giant rock.

Macabre astrological automaton clock dating to the late 1400s.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

The first museum in the world devoted to sexual gadgetry.

A mocking tribute to the past and modern leadership of Prague.

The "lovely red Vega" of the legendary record-settling pilot.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

This research center for rare prosimians is studying how they sleep to help prolong human life.

The only recreation of William Shakespeare's indoor playhouse.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Exact replica of the ancient monument, but much, much lighter.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

Hub of Scandinavian culture in a Minneapolis deli.

A toweringly silly piece of modern art has been delighting locals since the 1980s.

From burial ground bocce ball court.