After just one epic test blast, this literal loose cannon proved too explosive for combat.

Granting the right of way to ships over surface traffic since 1917.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

City Council meetings still happen in this historic building, impeccably preserved on the inside.

This unique museum cafeteria showcases the history and regional diversity of African American cuisine.

Puzzling...this tree looks like an assemblage of dismembered monkey limbs.

An early-19th-century hotel with a past that is steeped in the Civil War.

An overlooked memorial honoring the local Washington residents who died in World War I.

Look closely and you’ll notice that the color changes a third of the way up the tower.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

This municipal playground was co-created by the father of one of the most playful characters ever.

Stones speckled along Harris Avenue reveal hidden nuggets of the past.

This remarkably simple jail went over a century without an escape.

In this subterranean brick arcade, a small shop continues the ancient practice of bookbinding.

One poet's handmade, anachronistic home.

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

One of the most elaborate displays of Jellyfish is on display at the aquarium.

The building features one of the last remaining free-floating spiral grand staircases in the U.S.

The U.S. Navy's last diesel-electric submarine rests half-submerged in the middle of Portland.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

The wooden airship was the largest flying boat ever built.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”