Yale University's home for rare works, including the mysterious Voynich Manuscript.

The modern birthplace of Irish freedom.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

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

The home of the first American-born saint is one of the only curved buildings in New York.

Every year model trains zip through a miniature New York City that's now 150 landmarks strong.

Red frames showcase remnants of one of New York's original subway stations.

A self-made museum in Queens, New York continues to display the work of a sculptor known for paving his own way.

The former estate of the Guggenheims, part of the opulent Gold Coast that inspired the Great Gatsby.

Self-sufficient greenhouse floating on the Hudson River.

A town trapped in time - 1958 to be exact.

This plot of old-growth forest is the largest surviving remnant of New York City's original woodland.

Possible relics of the ancient Roman city are hidden in this restaurant's façade.

This once-grand marvel of engineering is now 41 miles of scenic hiking trail.

The 28-foot granite map plots the locations of 40 theaters in New York City.

The first and only carousel with a lineup entirely of insects.

"A hideous albatross in the Hudson River Valley."

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.