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

There must be a pun in this haystack somewhere...

The most confusing clock in New York.

Salute the leader of the proletariat.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

Commemorating the spot where the famous scientist fed his pigeons.

An artist's cute bronze subway sculptures belie his violent artistic past.

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

A hidden "place of interment for gentlemen."

A bit of retro transportation flair preserved in the world's largest department store.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

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

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.

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

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

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

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

This spooky statue sits outside a famous Prague theater.

A series of playful yellow penguins share a serious message about the environment.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

A surreal statue honoring Prague's favorite literary son.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.