Bronze footprints mark the path where a civil rights leader tried to march in peaceful protest before being knocked unconscious.

St. Augustine's record-setting narrow street was designed to protect against pirates.

The site of Martin Luther King Jr.'s arrest as he attempted to have lunch.

A building so large that it has its own weather.

A tribute to the Nirvana frontman hides beneath the bridge that was the singer's beloved hangout spot.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

More than 2,000 species of tropical plants call this nature preserve and sanctuary home.

This legendary urban waterfall creates a dazzling display of rainbows.

In 2018, Pohoiki Road was severed by lava flowing from the eruption of Kilauea.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

Football field-sized microalgae production tanks on the Hawaiian coast create a stunning view from space.

This unusual lava tube spouts seawater during high surf.

Try your hand at old-fashioned coffee growing at this museum devoted to one of the world's most coveted beans.

A controversial memorial at the place where Captain Cook met his violent end.

These ancient sacred grounds granted amnesty to those who managed to reach them.

This black shoreline is made up of exploded lava particles.

The southernmost point in the United States is a beautiful place to look at but a deadly place to wade in.

An ever-evolving wall of graffiti art off East Liberty Street.

The mounds at this site were reconstructed with the help of archaeologists and historians.

The only remnant of a small mining town is an abandoned railroad tunnel that is steeped in ghostly lore.

The remains of a massive blast furnace in what was once one of the country's largest iron-producing regions.

Rare recess caves fill this unbelievably beautiful Ohio park.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.