The walls of the iconic dome are hollow and have a secret stairway.

There’s a hidden military meme engraved on the World War II Memorial.

Sniff the Titan Arum's rotting flesh.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.

A way to take your secrets to someone else's grave.

A tree that grows parallel to the ground was declared Brooklyn's "crowning curio" by the poet who saved it.

This city park was once a lookout point for George Washington’s army during the Battle of Brooklyn in 1776.

Michael Jackson got Bad and Crocodile Dundee walked on heads in this iconic Brooklyn subway station.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

The body of at least one victim of a construction accident was left behind in the collapsed pylon, buried under tons of concrete.

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

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

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

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

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

Avoid gangster interaction while window-shopping.

The site of the deadly Triangle Shirtwaist Factory Fire.

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

The highest rapid transit station in the world.

One of two giant blue cockerel statues erected with an intentional double meaning.

This 1960s kinetic artwork has been restored and is once again whirling away in downtown Minneapolis.

This iconic water tower and failed bandstand is open for panoramic views once a year.