This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

Monument to a suicide protesting the Soviet invasion.

Macabre astrological automaton clock dating to the late 1400s.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

A church of bones, decorated with 40,000 human skeletons.

Steadily reminding Czechia of its past.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

Looming communist pillar with a Czech twist.

Bohemian paradise covered in majestic forests.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

Concrete strongholds stand guard over the Golden Gate.

The most beautiful Taco Bell in the world even has surfboard parking.

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

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

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

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

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

Golden Gate Park's historic collection of plants.

A man-made island in scenic San Francisco Bay.

San Francisco's newly reopened hands-on science museum.

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