The residents of the Neighborhood of Make-Believe live without much fanfare within the Pittsburgh Children's Museum.

Tucked into Pittsburgh’s North Side, the Mattress Factory is a labyrinth of permanent, room-sized installations where artists transform entire spaces into mind-bending, immersive worlds.

Its vintage camera collection gives a snapshot of the past as viewed through a photographic lens.

The souvenir got the company’s founder out of a pretty pickle at the World’s Fair.

When oil was discovered just outside of Pittsburgh, the city became home to this regional stock market.

This quarter-mile tunnel under the Bluff in Pittsburgh bends at a 45-degree angle.

This riverside restaurant delivers elegant dining in a historic 1901 train depot. 

There aren't too many operational funiculars around, but Pittsburgh has two!

Color-coded signs direct drivers on a network of routes designed to avoid Pittsburgh traffic.

The scorched Lisbon church that survived two earthquakes and a massive fire.

The devil-defying mark left by a saint as a boy is visible inside Lisbon's cathedral.

Sip cherry liqueur at a bar dating back to 1840.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

A deer-headed statue that brings together a 12th-century legend and big wave surfing.

A square-domed symbol of resilience in the heart of the old Jewish Ghetto.

This sandstone mansion was the home of two of Oregon's most important pioneers.

When this 400-year-old fountain fell into disrepair, officials covered the mess up with what looks like a giant soup tureen.

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

The relics of dozens of martyrs are stored in a single chapel.

This 17th-century passageway is home to numerous bookshops, a witch legend, and the oldest pizzeria in the world.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

This massive boulder was hurled into a Zurich church when a gunpowder depot was struck by lightning in 1652.

A statue of Charlemagne, created in the 1400s, once overlooked the city, and is now located in a crypt.