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

These gardens recreate unique and endangered Michigan habitats.

One-of-a-kind museum inside the first Boeing 747-400 ever made.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

You have to know where to look in this rather ordinary-looking square to find hints of its past as a dissidents' cemetery.

The final resting place of the liberator of Argentina is guarded around the clock by two soldiers.

A bright little alley in La Boca is a part of tango history.

105-foot wide giant metallic flower blooms anew every day in the heart of Buenos Aires.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

Known as the "Finger of God," a dramatic rock formation resembles a divine hand extending towards the heavens.

A 125-meter long "tribute to the Brazilian people."

A Gothic gym and community space that encourages fitness for misfits.

A retrofuturistic art installation in the Pittsburgh Airport.

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

A T. Rex statue dressed as Mister Rogers honors the children’s-television pioneer.

Once the most painted on object in the world, this short campus fence is well on its way to being so again.

Mutant vegetables, transgenic mosquitos, and atomic rodents span the walls of this one-of-a-kind museum.

This giant, rotating globe was built to celebrate the expansion of a company that makes steam cleaners and pressure washers.

Pittsburgh’s largest and most detailed model train display began as one WWI veteran’s hobby.

The largest clock face in the United States is twice the size of Big Ben and infinitely more ad-sponsored.

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

Chase waterfalls, hiking trails and more.

A local dive where religious kitsch, Southern identity, and queer culture collide.