One of the greatest heroes of the Titanic tragedy came from humble beginnings to this beautiful home.

One of few lasting examples of the brief octagon craze that developed into folly.

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

This private residence was the template for one of the most beloved television homes of all time.

A historic hotel that made a cameo in Hitchcock's classic film has no intention of letting guests forget its fame.

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

Tiki luxury on Nob Hill.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

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

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

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The notorious "Hanoi Hilton" where Vietnamese colonial subjects and later American POWs, including John McCain, were imprisoned.

This network of tunnels housed an entire village for years, and even had a hall for screening movies.

One of the world's tallest statues is also one of its most hated.

Stalin's secret bunker.

Church built on the site where the last tsar of Russia and his family were killed.

The tallest hotel in Europe.

Moscow's most popular cemetery includes the graves of numerous cosmonauts.

A sculpture park of the tossed aside relics of the USSR, from Stalin to a massive Soviet emblem.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.