A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

This Manhattan skyscraper is a reminder of the brief but glorious age of urban air taxis.

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

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

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

The most confusing clock in New York.

Salute the leader of the proletariat.

Avoid gangster interaction while window-shopping.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

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.

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

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

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

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

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

A terrific purveyor of natural history objects and curios.

Make a tough dinner decision: Octopus wasabi roulette or bull penis?

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

This unique eatery offers a taste of Estonia's "Onion Route."

Plaques celebrating Lithuanian writers freckle a wall of this picture-perfect path.

This charming Latvian lane doubled as Baker Street on the Soviet Union’s version of Sherlock Holmes.

A series of concentric circles represented a bold new experiment in socialist urban planning, and it notoriously difficult to get around.

A statue of the Soviet leader still stands in a quiet corner of Estonia’s most Russian city.

This ornate church has survived Nazi and Soviet occupation, including a short stint as a Soviet-era gymnasium and cinema.