A quiet, gothic haven nestled between Pittsburgh's Squirrel Hill and Point Breeze neighborhoods.

This public park was the site of the largest civilian disaster of the Civil War.

A portion of the old Pirates stadium over which a defining home run once flew still stands even after the rest of the stadium was torn down.

This picturesque stream was up until recently the site of a ten story mountain of slag and sewage.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

Eclectic collections, artwork, and some feline friends fill the writer's former home.

The final resting place of the great navigator, or maybe his brother.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

Single runway interrupted by a busy road that cuts across its middle.

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

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

At this faithfully preserved medina off the Moroccan tourist circuit you can walk through six centuries of history in one day.

Founded as a refugee camp, now a popular tourist spot.

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

God's Saharan sandbox of wrath.

Commonly acknowledged as the only public monument to the Devil himself.

This museum houses an imposing skeleton army comprised of creatures great and small.

This elaborate towering structure was once famed for its revolutionary height.