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

This Italian-style temple replica has been threatening to fall off the Irish coast for hundreds of years.

Modern design and unusual architecture make this mountaintop temple no ordinary Buddhist retreat.

High in the clouds of San Marino sits an ancient tower with some curious prisoner graffiti.

A circle stone within a stone circle.

The ancient mosaics here are considered among the finest in the world, and serve as a stunning record of Greco-Roman daily life.

A red sandstone freestanding monolith rises out of the sea in northern Scotland.

Beautiful mosaics cover the first stations opened on New York City's newest subway line.

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

The composer did some of his finest work in this country home, including "The Nutcracker."

This 700-year-old street food market features baby octopus and soy donuts.

The ruins on a deserted tropical island in the Philippines bear the scars of WWII.

A remarkable two-country morph, this town is part of Germany legally but is by all other measures Swiss.

During the holidays, a vintage subway train whisks New Yorkers back in time.

This study room in the New York Public Library saw the creation of one of contemporary America's greatest traitors.

This small New York museum examines Chinese history from its origins right up to its arrival in the city.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

An unassuming secret door once led to a legendary watering hole.

New York's unstoppable progress turned this cemetery into the smallest burial ground in the city.

This semi-hidden Manhattan restaurant is based out of a loading dock.

A famous songsmith's custom piano, dubbed "High Society," is hidden just out of sight in one of New York's finest hotels.

The origins of midtown Manhattan's anachronistic wooden farmhouse remain a mystery.