The Victorian-era greenhouse is stuffed with tropical plants, and open 365 days a year.

Known as "Toronto's Flatiron."

One of the largest underground systems runs under Canada's largest urban center.

A botanically themed auditorium blooms within the world’s last operating double-decker theater.

While most bridges allow roads to pass over water, this one allows water to pass over a road.

The world's longest wildlife overpass provides Hilversum's critters with a safe alternative to trying their luck on the roadway.

A grassy pyramid named after a French battle.

This large sand dune in the Netherlands is home to wind-whipped trees with "floating" roots.

This gigantic monument hidden in the woods was built to thank the Dutch for sheltering Belgian refugees during World War I.

The gargoyles and grotesques of the 21st century are here—22 emoji built into a new building in the Netherlands.

At the base of this tower, a plaque marks the original center point of the Netherlands.

The name of this tiny pocket park tucked between two buildings on Manhattan's Upper West Side is Latin for its location: "seventy-one."

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

Whimsical cookie-themed plaques mark the birthplace of the Fig Newton.

This nearly endless university hallway is home to a unique sunset known as "MIThenge."

Bouncing, delightful, mechanical art at the MIT Museum.

Three prestigious academic collections come together to create a world-class natural history museum.

This tower commemorates the spot where George Washington hoisted the Grand Union flag.

The classic Christmas carol was written at this Massachusetts tavern in 1850.

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

A rare and unique example of an 18th-century door latch calls this restaurant home.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

The final resting place of soldiers' loyal canine companions.

A six-ton wedding present for the King of the Scots.