The vaulted ceiling is home to a scurry of “squirrelgoyles.”

The 7,000-year-old calcium carbonate formation creates a magnificent natural bridge.

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

This mesmerizing kinetic sculpture blossoms endlessly in the breeze.

The rare American Civil War-era weapon was never fired in anger.

This classic steam-powered train takes tourists on a nostalgic trip around the Connecticut River Valley.

This ancient Egyptian obelisk still bears the wounds of World War I.

This oddity shop contains everything from antique tools to a human skeleton.

One of the few Glatt kosher delis in the United States is a cornerstone of its Hasidic neighborhood.

A swaggering, monumental souvenir of the most extravagant party Montreal’s ever thrown.

Inside houses a vast collection of military aircraft and missiles spanning the ages.

This giant satellite antenna services the transmission needs of government agencies and cable programmers.

The bronze uniforms commemorate the vital role of women during World War II.

This plaque is dedicated to one-half of the Magliozzi brothers and their hit radio show, 'Car Talk.'

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

At this small shop off a dirt road in the forest, the specialty is eel the owner caught and smoked himself.

This half-ton piece of the Alps sits at the base of the CN Tower.

The highest rapid transit station in the world.

This beautiful Brooklyn monument over a crypt memorializes a grim and largely unknown story from the American Revolution.

This once sprawling resort now sits abandoned, filled with graffiti and vibrant colors from an era long passed.

One-time largest man-made structure in the world will be a park in 30 years.

An unrealized dream to wirelessly electrify the entire Earth.

The first commercial nuclear power plant constructed on Long Island.

The final resting place of Harriet Tubman and other famous historical figures.