A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

Once America's tallest structure, now a Baltimore landmark.

A lover's walk between hilltop towns, decorated with graffiti love notes.

Five candy-colored villages on the Italian Riviera.

This cathedral hides a sculpted dog that determines your fate and an unexploded shell from World War II.

This triumphal 16th-century arched gateway leads to the oldest street in Palermo.

This skeletal, unfinished Gothic church once housed a miraculous masterpiece by Raphael.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

Every inch of this chapel is covered in craftsmanship from across the world.

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

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

A 1,000-year-old church holds the bones of the Christian martyrs who died hiding inside it.

This high-speed test track is popular with car manufacturers, speed freaks and orbiting astronauts.

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

The former sign of this immortal music venue is just that--undying.

A reminder to choose water over wine since 1888.

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

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

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

The one-time epicenter of American songwriting is now a little remembered Manhattan commercial block.