An inconspicuous footbridge beloved by San Diego locals.

Take a leisurely ride on a 1906 cable car or a 1907 steam locomotive.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

These two K-9 memorials commemorate the sister cities of Edinburgh and San Diego.

Dedicated to the "World's Luckiest Fishing Village."

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

Also known as the Square Colosseum, this building is a prime example of fascist-era rationalist architecture.

A secret hatch containing two parchments was discovered in this statue over 40 years after its installation.

Visiting this café is like visiting the Austrian grandma you wish you had.

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

From cartoon characters to tiny tanks, a guerilla sculptor's little bronze statues are hidden throughout the city of Budapest.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

A random tree outside a Budapest hotel has become a DIY shrine to the late singer.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

A Nesting Doll of Churches.

Inside this building is another country within Rome, a sovereign entity without a physical territory.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Go inside to really appreciate this 500-year-old technological masterpiece.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.