"X" marks the spot of an echo chamber in the middle of a plaza.

A pink and gray pair of pachyderms advertise a fireworks shop.

The language and heritage of a nearly forgotten culture can still be explored in this Southern enclave.

On Hilton Head Island this bronze King of the Sea rules all things briny—and lets you know if you’re late for lunch.

Downtown Minneapolis mixed art and function by turning some of their sewer covers into works of art.

A toweringly silly piece of modern art has been delighting locals since the 1980s.

Red frames showcase remnants of one of New York's original subway stations.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

The Pentagon sits on a former island that was in Virginia at low tide and D.C. at high tide.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

Formerly the most gerrymandered district in the U.S., it twisted and turned along racial borders.

The world's largest fully steerable radio telescope.

This rural community has attracted both scientists and techno-refugees due to its federally-mandated lack of technology.

Take a steam-powered ride straight out of the past on this Appalachian rail line.

This unusual building straddles two countries.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

There’s a special club house at the top for the bell ringers.