If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

A daily replay of the experiment that proved the rotation of the Earth.

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

The oldest surviving botanic garden in the United States.

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

A field of nothing but boulders which resembles a giant's gravel driveway.

The body of St. John Neumann and his collection of hundreds of relics, on display in a Philly church.

Yo, Adrian!

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

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

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

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.