This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

Read a book next to a Midtown waterfall.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

Rummage through this sunken ship, but leave your scuba gear at home.

Elevated freight railway turned wildly successful urban park.

Great place to have a drink and a bite to eat in an atmosphere laden with New York's Bohemian past.

A popular European tradition makes its way to the states on one of America's most famous bridges.

Visit the monolithic tomb of America's most famous general.

The rough and tumble president's childhood home displays the shirt he was once shot in and the speech that saved him.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

A terrific purveyor of natural history objects and curios.

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

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.