Collect holy water from a Bronx grotto.

A monument stands to the famous suffragist who penned the declaration for women's equal rights, including the right to vote.

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

During the holidays, a vintage subway train whisks New Yorkers back in time.

This semi-hidden Manhattan restaurant is based out of a loading dock.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

An unassuming secret door once led to a legendary watering hole.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

A dilapidated dock tells the story of Titanic's missed arrival.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

This Toronto garden collects stares and tchotchkes in equal measure.

The site of a tragic massacre that spawned a multimedia franchise.

An eccentric playboy's astounding natural history collection.

This forgotten graveyard in rural New York State once served a pioneering hospital.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

A formerly abandoned mental institute, now back in business.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

Final resting place of Typhoid Mary.

The first and only carousel with a lineup entirely of insects.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

A collection of more than 12,000 shoes, displayed in a building shaped like a shoebox.