A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

In the best of all possible worlds, everyone will get a chance to see this statue in which Voltaire's heart is interred.

This historic hotel invented the chocolate brownie.

This tribute to the 16th-century composer is now an unusual shrine to Michael Jackson.

The medieval network of canals hidden underneath the city is opened to explorers each year.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

These 12th-century catacombs carved into a mountainside were a place of mysticism and Christian hermitages.

When oil was discovered just outside of Pittsburgh, the city became home to this regional stock market.

Meet your friends, marry your true love, or tell your enemies to kiss your butt under this historic Pittsburgh timepiece.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

This massive statue is the personification of Bavaria and the first colossal statue of the modern period composed of bronze.

One of only two commuter aerial tramways in the United States.

Elevated freight railway turned wildly successful urban park.

Try not to get slimed in Tribeca.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

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

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

A crumbling hospital from the 1850s on Roosevelt Island.

A terrific purveyor of natural history objects and curios.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.