With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

America's first federal monument.

A reclusive Memphis neighborhood is home to decades worth of misunderstood Masonic folk art.

This head-spinningly bizarre Depression-era art cave is wall-to-wall quartz and Jesus.

An homage to the pointers and retrievers that have long been a hunter's best friend.

This university research project is the U.S. government's weed dealer.

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.

William Faulkner kept his beloved estate wild and untamed.

The most confusing clock in New York.

The notorious headquarters of a corrupt political machine.

A 19th-century politician who died after walking home in a blizzard is honored with this Manhattan statue.

This monument to a veteran of the Mexican-American War is one of only two in Manhattan that serve as an actual mausoleum.

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

A semi-scholarly approach to sex.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

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

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

A terrific purveyor of natural history objects and curios.

Try not to get slimed in Tribeca.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

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

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

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

Magnificent New Deal Murals evoke a time when New York City harbor was one of the world's greatest and busiest ports.