This 13th century Gothic brick castle is the largest in the world by surface area.

The real-life site of Ichabod Crane's infamous gourd attack.

This tiny church near Sleepy Hollow contains Henri Matisse's last work, a rose window, and nine windows by Marc Chagall.

A whimsical village of unique treehouses resides in a Washington forest.

A total of 14 men held the title of "president" before George Washington—their historical legacies are enshrined in the lobby of a hotel.

Just outside the Naval Academy, Hell Point is a historical marker that could easily be the point where failed students wait for the bus.

This memorial honors five journalists who were killed in a mass shooting in 2018, and affirms the importance of the first amendment.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

Hidden behind a gate in Greenwich Village is a little farmhouse that once served as the writing studio of a bestselling author.

Three acres of mythology-inspired sculptures are visible from the highway.

The universally beloved children's television figure is interred on a high hilltop in one of western Pennsylvania's oldest cemeteries.

These steps offer a breathtaking view of one of Europe's most besieged fortresses.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

This 22-acre botanical garden is home to the largest collection of rhododendrons in the world.

Imagine having a street run right through your home, or better yet, a historic bridge three stories high.

In this quiet village, a blue plaque marks the spot where the famous fictional detective retired.

You must take the A train... to the last active cemetery in Manhattan.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

In the bowels of a 19th-century brewery lurks a fine-dining restaurant offering an array of themed feasts.

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

The oldest active church in Pennsylvania is also the second oldest Swedish Church in the United States.