Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

Infamous marsh filled with toxic waste, World War II-era London rubble, and dead mobsters galore.

The highest point in Delaware is located under a trailer so this marker across the street will have to do.

The most decorated dog of World War I is preserved in the Smithsonian.

The rogue roots are gradually consuming some of the historic marble grave markers.

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

These boots are made for selfies.

Soldiers honored the beloved Pat with a special grave.

This museum showcases the history and contributions of the U.S. Army to the medical industry, both on the battlefield and off.

An artist's cute bronze subway sculptures belie his violent artistic past.

The first piece of public art dedicated to LGBT rights.

The most confusing clock in New York.

This abandoned subway station can still be seen on regular commuter trips.

This Fifth Avenue church has long been the favored worshiping place of Broadway actors and vaudeville performers.

A whimsical, but often overlooked clock in Park Avenue.

The 28-foot granite map plots the locations of 40 theaters in New York City.

Once thought to be the fabled Holy Grail, it is now known to be an oil lamp.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

The final resting place of a wealthy landowner who helped create the largest public park in Western Massachusetts.

The largest glacial erratic boulder on Cape Cod.

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

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

In this relatively flat state the highest point is an honored place.

A National Historic Landmark with a scenic clock tower and park filled with deer and peacocks, plus a military museum.