A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

A modest reminder of treacherous waters at the Golden Gate.

A 300-ship graveyard, with a few still visible at low tide.

A winding path built in secret on the edge of the continent.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Every president in history is immortalized in bronze in downtown Rapid City.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

This kaleidoscopic mural shows Bob Dylan throughout his transition from young troubadour to Nobel laureate.

One of two giant blue cockerel statues erected with an intentional double meaning.

Minnesota's highest point is a scenic vista marked by a plaque and armies of mosquitoes.

When waves crash onto this section of beach, the rocks sing a song.

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

The honor of highest point in Michigan was almost given to the wrong peak before this mountain won out by 11 inches.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

The highest point in South Dakota contains the ashes of Valentine McGillycuudy, the "Holy White Man."

The highest point in Florida is still the lowest high point in the country.

A museum dedicated to the alleged Roswell Incident.

Pennsylvania's highest point is spotted with boulders which were pushed to the surface by nothing but cold.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.