A small etching on the white marble parapet was written in runic script by a Viking mercenary.

The sculptor was instructed to add “stallion attributes” to the general's bronze mare.

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

The farmhouse owned by the Danish author who wrote "Out of Africa" is now a museum honoring her legacy.

The Lincoln Memorial has inspired many, even though a word on the inscription appears to be spelled incorrectly.

The ruins of this ancient fortification wall sit in the middle of a quiet, residential intersection.

One of Vienna’s oldest (and perhaps most haunted) alleys, allegedly with a bloody past that gave it its name.

Morocco's Argania trees are infested with nut-hungry goats.

A dilapidated dock tells the story of Titanic’s missed arrival.

In a country where driving from one town to another is literally impossible, this small stretch of gravel is a remarkable feat.

Eat the ultimate iteration of Portugal's most beloved pastry.

Once a lonely sentinel on the edge of the Great Plains, this rebuilt trading fort offers a glimpse of life on the Santa Fe Trail.

The original version of Porto's most famous sandwich is just as good here as it was a century ago.

A beautiful Victorian-era cemetery, complete with a miniature village.

Narrowest house in Boston.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

A public work of art that also provides some relief from the summer heat.

When this monument to Slovenia's national poet was erected, it's said to have sparked the ire of nearby church authorities.

Sample port and quinine-fortified wine at this fourth-generation winery near Porto.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

This bridge over D.C.'s Rock Creek Park is sometimes called the "Buffalo Bridge" because of its four buffalo sculptures, which were cast from a single piece of bronze.

Behind an abandoned storefront is an example of pioneering 1930s gas station architecture.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.