The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A living time capsule of the 1960s Richardson Bay water-front.

At the base of the Golden Gate Bridge, a small sign basically begs for a high-five.

Chevron maintains one “Standard” brand station per state so it doesn’t lose the trademark.

This tall and trim architectural oddity is one of the skinniest buildings in San Francisco.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

The iconic remains of the original Academic Hall that burned down in 1892.

Two Ming Dynasty lion statues guard the entrance to the journalism school.

The obelisk meant to mark the founding father's grave at Monticello is actually on the University of Missouri campus.

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.

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

Watch the newest land on the planet form before your eyes.

This black shoreline is made up of exploded lava particles.

A beach made of semi-precious green sand on the Big Island of Hawai'i.

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

Submerged lava formations create incredible waterworks.

This blowhole is supposedly caused by a trapped monster.

This industrial area was the dumping ground for massive amounts of trash, some of which washes up as tiny bits of sea glass.

Striking occult iconography on a medieval German church.

A 1:2 billion-scale solar system leads visitors into this German university town.

A beloved street vendor is memorialized outside a German train station.

A comedic homage to a beloved German actor.