These disused steel furnaces are now haunting ruins that may one day be a national park.

The last street in Pittsburgh that's paved with wood.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

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

Elaborate tile work in this railway station tells the story of Portugal.

The history of drinking is told through 1,800 cups, chalices, and glasses at this exhibit.

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

Sip cherry liqueur at a bar dating back to 1840.

This charming candle shop has been in business since 1789.

The world's oldest bookshop still in operation.

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

Get in line for Lisbon’s most famous sandwich.

The best place in the world to buy tinned fish.

Hidden beneath a beautiful overlook you’ll find the history of the city depicted in comic strip format next to a pay toilet.

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

One man's remarkable private collection of art from around the world.

Outsider art meets paleontology at this roadside reptile repository.

Herbert Hoover's "Brown House" rural presidential retreat was a PR disaster amid the start of the Great Depression.

One of the last active volcanoes on the Eastern seaboard.

This historic mansion was built as a symbol of love between a husband and wife.

A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.

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

The tragic reality of a town riddled with rumors of haunts, chemical spills, and serial killers.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.