The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

A bizarre roadside attraction and the first instance of miniature golf in the world.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

This historic train station has been converted to a locomotive themed hotel.

Experience what life was like in Ireland during the Viking and medieval ages.

More than 5,000 artifacts donated by the people of the city, plus a room entirely devoted to the band U2.

Pizza with a side of fine art.

A beloved Chicago music venue offering cold beer and lots of “Friendly."

One-of-a-kind preserved ruins of an abandoned 1880s church in Chicago's Pilsen neighborhood.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

It's a pretty creepy lock-up.

A centuries-old church stands as a testament to Boston's "father of architecture."

The modern birthplace of Irish freedom.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

A hugely vast Irish landscape of barren rock that stretches for miles.

This modest plaza in Moneygall, Ireland has cashed in on its distant connection to the U.S. president.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

Atlanta's strange assortment of concrete pillars inspires reflection in some, confusion in others.

An underground magnet for ever-changing street art.

It was once nicknamed "the most bombed hotel in Europe."

A statue honoring 44 continuous years of greeting passing ships.

This twisty sign depicts the chain's first logo.