The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

Once the site of the Hawaiian monarchy, this building was originally designed as a palace.

Once a sanctuary for Honolulu’s queer community, this legendary landmark is in the heart of Waikiki.

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

A whimsical, punny collection of "fence art" outside the tiny mountain town of Baker, Nevada.

The longest living non-clonal organisms on Earth.

This crumbling stump is all that remains of what was once thought to be the oldest living organism.

The only bridge in the United States where BASE jumping is legal without a permit year-round.

Home to the deepest rift anywhere on Earth.

Supposedly Satanic numbers adorn this preserved submarine sail.

This highest peak in Idaho can only be reached by traversing a formation known as "Chicken-Out Ridge."

The highest point in Washington state is a volcano covered in glaciers.

The alley connecting two of country music’s most historic venues has a rich history of its own.

The 10th-tallest pyramid in the world, this former sports arena is now home to a massive Bass Pro Shops store.

A memorial dedicated to the Tejano superstar Selena Quintanilla-Pérez.

These tree-filled acres are also filled with history, hiking and a celebration of Appalachian crafts.

Secluded springs in the Rio Grande Gorge offer hot bathing beside the haunted ruins of a stagecoach stop.

Odd castle-like structures for collecting water sticking out of the Mississippi River.

Shoreline strewn with the remains of ghostly fallen trees.

Some believe this tree to be more than 1,500 years old.

A lingering bit of Space Race nostalgia lies in the middle of the desert.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

A modest Alabama recording studio where some of music’s biggest voices found their sound.

The tallest dam in Montana and top 10 in the country.