The most loyal of little dogs, or a Victorian era publicity stunt?

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

In one Santa Monica parking lot a mushroom cloud made of chains heralds a message of peace.

One of the first skyscrapers in Santa Monica, and a famous getaway for the Hollywood elite of then and now.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

This concrete ship has had four careers - World War I tanker, floating amusement park, fishing pier, and artificial reef.

A Roman-style column in Oregon hides a spiral staircase inside.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

Former villa and estate of James Deering developed to preserve native tropical forests.

The highway's southernmost spot is a beloved local attraction.

A monument celebrating the idea of reaching inaccessible places.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world’s largest coastal brick fortresses.

An unexpected Easter egg lurks in the background of a cherub wall relief at the Breakers mansion.

The oldest still-operating tavern in the United States was once owned by a pirate.

A single light illuminates one man's overshadowed contributions to street lamp history.

Oldest synagogue in the United States.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

This seaside Italian village doesn't just look Escher-esque, it actually inspired the mind-bending artist.

This monument remembers the first Japanese Americans forcibly relocated during World War II.

Rustic natural hot springs in the deciduous rain forest.