A 110-foot concrete dinosaur once sold fossil fuel from its belly.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

This stretch of highway is said to be haunted by ghosts of settlers whose graves were paved over.

An unrecognized nation-state created in the 1820s to avoid taxes.

Ruins of an old sugar mill sitting quietly next to a park in rural Florida.

A beacon atop a downtown building provides Bostonians with weather forecasts and baseball news.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

The only one of New Hampshire's original 14 World War II watchtowers to survive in near-original condition.

This iconic 1958 tower welcomes air travelers to Tucson with neon-lit letters and architectural style.

One of the last remaining movie theatres in the country that features a rear-projection system.

It was an experiment to prove that glacial boulders and rocks can be used in constructions and dwelling.

Millions of numbers carved in glass represent the tattoos forced upon victims.

The statue of John Harvard isn't actually John Harvard—or even, technically, the founder of the school.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

An architectural oddity hides in plain sight on this iconic London bridge.

At an isolated roadside rest area stands a monument marking where famous Western star Tom Mix died in 1940.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

These unusual rooms on wheels are holdovers from the 1960s.

A building so large that it has its own weather.

America's original house of worship for Spiritualism, the religious movement based on communing with the dead.