Taking the subway here means doing so over a bridge located in the middle of an estuary.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A marvel of Byzantine engineering under the streets of Istanbul.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

This metro station doubles as an unintentional paleontology museum.

This memorial to the victims of the Romanian Revolution of 1989 is often compared to a potato on a skewer.

Romania's triumphal arch looks out over Bucharest.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

The preserved arm of a third-century sorcerer is believed to have the power to lift curses and spells.

This once-derelict building is now one of the most beautiful bookstores in the world.

A quiet spot commemorating two naturalists who had to choose between love and the university at which they both taught.

This small stone chapel is a hidden gem just outside the University of New Hampshire campus.

University of New Hampshire holds the documentation and artifacts of local alien abductees.

The most beautiful Taco Bell in the world even has surfboard parking.

Small plaque marks the spot, but the true center is located about half a mile away on a private pig farm.

It's big, it's a ball, and it's made of twine—the world's largest of its kind.

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

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

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

A mechanized clock where a man fights off a dragon, crab, and rooster.

The oldest stone house in Paris was built by its most famous alchemist.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.