A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

Every summer West Seattle experiences a housing bloom.

The only parking meter in the entire town, it is surrounded by 100 free spaces.

This relic of transportation history still stands in this Indiana city.

Nine nice parcels of land along a flight path offer a quiet respite... until a plane soars overhead.

A hollow cement depiction of time's inexorable effect on the human body.

The oldest continuously-operating Chinese restaurant in the United States has been in business since 1911.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

Drink and dine in a coral cave that's at least 120,000 years old.

This picturesque mansion has gone from opulent ruin to nature museum.

Colloquially known as “piss alley,” this narrow street filled with tiny bars and barbecue stands looks like it was pulled straight out of “Blade Runner.”

An eccentric inventor's castle home with its own indoor weather system.

The medieval network of canals hidden underneath the city is opened to explorers each year.

A whimsical cottage from the 1300s with a preserved Victorian-era post office inside.

A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.

Roughly 17 million letters to Santa have found their way to this Arctic Circle post office.

The fully functional, submerged Vanuatu Post Office is definitely one of a kind.

The smallest post office in the United States is no bigger than a broom closet.

This 5-by-6-foot wooden hut is the smallest historic post office in the U.S.

This modest post office sits on the site of H.H. Holmes' famous murder castle.

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

Travelers exchange letters with woodland creatures at this mini post office.

Since the 1700s, this old barrel has acted as a post box that relies on the kindness of travelers.

A swing to dangle you off the very edge.