17th century streets hidden under Edinburgh were once a breeding ground for the black death.

Only 68 people per day are allowed to visit this New Zealand bird-watcher’s paradise.

Phil Mortillaro uses keys to bring art back to the Village.

An aptly-named street near the birthplace of the modern LGBT rights movement.

The first piece of public art dedicated to LGBT rights.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

A crumbling hospital from the 1850s on Roosevelt Island.

Genesis of modern hydroelectric power.

Learn about the last river many crossed to find freedom from slavery in the United States.

Western New York's largest independent bookstore doubles as a historical repository of all things Niagara Falls.

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

Toxic waste disaster that founded the Superfund program.

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

The medieval ferry service has been going strong since the 14th century.

Iceland's first pagan temple in 1,000 years is underway in Reykjavík.

The Arctic Circle runs through this isolated spot north of Iceland.

These concrete domes were installed on an Icelandic bluff to honor a very specific musical tradion.

The summer tourists on these cliffs are thousands of seabirds.

Eerie ruins of an abandoned medieval fishing village crumble atop an unforgiving stretch of earth.

The bright red stripes streaking across the rocks are the star feature at this Icelandic waterfall.

A sulfuric martian landscape that looks far better than it smells.