Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

This medieval city gate is now a blend of the past and the modern world.

Ancient mysterious ruts carved in the bedrock.

This unique building in the main square stands out among the city's typically Baroque architecture.

The ruins of an ancient Roman tomb hidden in the basement of a trendy clothing store.

Where commuters walk through remnants of an ancient Greek necropolis.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

This striking, two-toned confluence of rivers is visible from space.

One of few lasting examples of the brief octagon craze that developed into folly.

This turn of the century masterpiece has a mysterious goaty interloper.

Golden Gate Park's historic collection of plants.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

This historic mini-suspension bridge was swept away once but is now here to stay.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

These light, hollow rolls have been linked to Acadia National Park since the 1890s.

If a visit to this farmhouse feels as if you are stepping into an artistic masterpiece, you’d be right.

When the town wouldn't allow the fast-food behemoth to build a new restaurant, they put one inside an 1850 home.