Prone to disastrous fires, the city of San Francisco has the Guardian, a fireboat gifted by residents, to watch over them from the bay.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

A masterpiece in Golden Gate Park by virtue of the artist’s debt.

Here, Father Agapius Honcharenko established his homestead, becoming the first nationally conscious Ukrainian to settle in the United States.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

Budapest's Communist-era statues, banished to the suburbs.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A beautiful waterway tucked in the corner of a power plant.

Launchpad for the US military’s dead mouse operation to battle millions of snakes.

Hamburg's first legal sex work is relegated to a gated street that still does not allow pedestrian women.

Steadily reminding Czechia of its past.

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Metro station with a claim to rock n' roll fame.

Cold war icon and onetime "hole" in the iron curtain.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A subterranean house of worship carved right out of the bedrock.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

Stockholm's deepest subway station is also a stunning ecological wonder.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

Giant Redwood-themed cafeteria operates under the golden rule, "Dine Free Unless Delighted."

This opulent hotel has been visited by Spider-Man, Charlie's Angels, and the Ghostbusters.