Top must-see US post offices

Lum and Abner Museum and Post Office, Pine Ridge, Ark. The town originally named Waters was officially changed to Pine Ridge after the popular radio show Lum and Abner was based on the town, but changed to names to Pine Ridge, on the air. Henry M. Waters, a local businessman started a post office in his small store in 1886 and the town’s school and church operated in the same building. Now the post office also serves as the Lum and Abner Museum, and maintains the same building it did 100 years ago. (Evan Kalish)

The James A. Farley [Main] Post Office, New York, N.Y. With grand columns and staircase, "you can't get any more grand or bold than this one," according to Kalish. (Evan Kalish)

B. Free Franklin Station, Philadelphia, Penn. The former home of Benjamin Franklin, this is the only post office that doesn't fly the American flag. The U.S. Postal Service was considering closing this site, but it is no longer in jeopardy. (Evan Kalish)

Main Post Offices, Bustins Island and Squirrel Island, Me. These two post offices are on remote islands only accessible by ferry or by boat taxi. Send off an envelope for the Squirrel Island's unique postmark. (Evan Kalish)

Old Chicago Main Post Office, Chicago, Ill. The architecture was thought up as the future of the postal service. This facility was built with a flat top to mail-servicing planes that could land directly on the building. While the concept never really flew off the ground, at the time the USPS figured would be more efficient than landing at the airport. (National Postal Museum)

Main Post Office, Agness, Ore. "They take the mail boat 30 miles up to deliver the mail," Kalish said. (National Postal Museum)

The Smallest Post Office in the U.S., Ochopee, Fla. The Ochopee, Fla., post office is the smallest post office in the nation. The 7x8-foot building, no bigger than a closet, used to be an irrigation pipe shed. "It's along the way to the Everglades, so sneak its great to sneak a peek before you go visit the alligators," Kalish told FoxNews.com. (National Postal Museum)

National Postal Museum, Washington, D.C. See some of the rarest stamps, historical mechanisms of postal operations, and strangest modes of transportation used to deliver the mail. (National Postal Museum)

Main Post Office, Hoolehua H.I. At the Hoolehua office, you can mail off a native-land coconut--no packaging necessary. Instead of a traditional piece of paper or post card, the Post-a-nut program supplies visitors with a dried coconut. All you need to do is bring a marker to write the address, pay for postage, and the post office will do the rest. It's so unique that it was featured on National Geographic. (USPS)