The legendary luxury train passage is commemorated with a charming museum inside its former eastern terminus.

This half-forgotten fortress was constructed by the Ottoman conqueror of Constantinople.

Have tea in a cemetery with a dazzling view of Istanbul.

Large miniature theme park with 100-plus models.

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

A gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

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

The ornate miniature mansions were built for Istanbul's feathered residents.

This crucial gathering spot along the "hippie trail" still displays old notes between traveling beatniks and backpackers.

A marvel of Byzantine engineering under the streets of Istanbul.

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.

This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

A guitar mounted on a wall in Temple Bar honors the Irish musician.

This monumental work of art symbolizes the coming together of a previously divided city.

Taste freshly foraged yarrow and black locust blossoms at this ambitious cocktail bar.