Walk along the medieval fortifications that have been protecting Tallinn since the 14th century.

During the Soviet era, the spire of this longstanding church was used as a radio transmission tower.

The Guardian of Tallinn.

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

A winding district gerrymandered into the shape of a mantis.

Walk through the history of American pop culture.

Bizarre Cavern.

A museum dedicated to exhibiting remarkable outsider art.

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

Home to the deepest rift anywhere on Earth.

For thousands of years, Native American hunters drove buffalo straight off this cliff in Montana's Yellowstone Country.

An entire town preserved as a historic landmark.

The residents at this Yellowstone wildlife park will certify your cooler as "bear-proof."

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

An architect's childhood fantasy treehouse made real.

A beautiful geyser under environmental threat.

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

This shrine to McDonalds' most iconic sandwich holds a 14-foot tall burger.

The last remnants of Fort Pitt also hold the distinction of being the oldest structure west of the Allegheny Mountains.

These light, hollow rolls have been linked to Acadia National Park since the 1890s.

The first bridge observation tower in the U.S. offers one of the best views of Maine.

This 19th century granite fortification is one of the most well preserved forts in New England.

The second-oldest garden cemetery in the U.S. was also a college brainstorm spot of Stephen King.

The eccentric mansion of one of the most popular horror authors of modern times.