Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Scattered throughout London are ancient remnants of the city's former bounding wall.

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

Yo, Adrian!

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

Statue of Lenin, from Cold War era Czechoslovakia, now in a neighborhood of Seattle.

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

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

The only structure left with direct ties to the Salem witchcraft trials of 1692.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

"Girl in a Wetsuit" is what happens when a sculptor has to find a way around a 100 year old copyright.

A beautiful geyser under environmental threat.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

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

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

A 100-year-old purveyor of curiosities, curios, and kitsch featuring mummies, shrunken heads, and a Fiji Mermaid.