The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

An ancient Egyptian temple in the middle of Madrid, Spain.

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

Three columns of volcanic rock shoot out of the ocean.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

The curious underground history of keeping Paris clean.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

A haunting collection of the vanished and disappearing natural world.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

France's national museum of scientific and industrial instruments.

The celebrated eyesore created by starry-eyed sweethearts.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The world's largest piece of copyrighted artwork.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

Each August, one of the largest religious (and food) celebrations in the country is held in Boston.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Ice cream stand, snack bar, and time capsule of milk conveyance.