This lavish room at NYC's French Embassy is a rare relic from the end of the Gilded Age.

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

Deep under Manhattan is the largest construction project in city history. So far, the project has taken the lives of 23 workers, or "a man a mile."

From scholastic to sepulchral - now under reconstruction.

The "Seinfeld" diner.

In the St. Francois Mountains in the Ozarks at 1,772 feet above sea level, Taum Sauk Mountain is the highest (and possibly oldest) peak in Missouri.

Treehouse motel and treehouse-building school.

World's largest collection of serial killer artwork and other macabre exhibits.

This humble star-gazing center touts itself as the "Birthplace of American Astronomy."

There are more than 4 million bricks inside this unofficial Lego museum in a former middle school.