Some of Arizona's best spit-roasted tacos al pastor can be found at a weekend swap meet.

Rare moles meet activism at this Oaxacan eatery.

Behind a grungy bodega facade, a Poblano family serves rich, home-cooked meals.

By night, this auto repair shop turns into a taquería serving up some of the city's finest al pastor tacos.

Iron Age grave stones and Viking burials, a short drive from Gothenburg.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

According to legend, this boat-shaped henge is built over the grave of a mythic king.

This Danish rock field is actually a sprawling ancient cemetery holding the bodies of 700 Vikings.

An intricately carved Viking church overlooks a glistening fjord.

Mounds, rune stones, and a 1,000-year-old church, left behind by Denmark's first two kings.

A stone in Wolin, Poland, marks the possible location of a legendary Viking fortress.

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

This burial mound is said to be the final resting place of Russia's first Viking ruler, Oleg of Novogrod.

This mysterious runestone embedded in a church wall is linked to the medieval cult of Saint Erik.

An otherworldly, fossil-rich cobble beach holds Viking graves, cairns, and other remains.

The suspected burial mound of legendary Viking Björn Ironside.

A perfectly circular stronghold constructed in the 10th century is now a nucleus of Viking culture housing a museum, village, and reenactment of an epic Viking battle.

A little lighthouse in New York City, surrounded by mysterious stories of insanity-driven construction.

Haven for steampunks.

The most confusing clock in New York.

The former hotel where Tesla invented the radio.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

One of only two commuter aerial tramways in the United States.

Ride the subways of yesteryear.