Rising 324 metres above Paris, the Eiffel Tower was unveiled in 1889 as part of the World’s Fair celebrating 100 years since the Revolution. Though controversial at first for its unusual, industrial look — many Parisians felt it clashed with the city’s classic architecture and called it an eyesore — it quickly became the city’s defining symbol. Today, nearly 7 million visitors a year come for the views, to snap that classic photo, and to experience standing atop one of the world’s most unforgettable landmarks.

Borrow a bike and explore Valladolid. A professional guide will share their local knowledge of the city in an entertaining, dynamic and funny way. The tour lasts for three hours and takes place during the daytime, or why not choose "Valladolid by Night" tour to explore the city under the moonlight?

Once a federal prison housing dangerous and notorious criminals, Alcatraz (The Rock) now welcomes tourists into the cell blocks once occupied by the likes of Al Capone, Machine Gun Kelley, and the Birdman of Alcatraz. Self-guided audio tours have dramatic narratives of Alcatraz’s grim history, including realistic sound effects one would hear in prison. Apart from the prison complex itself, Alcatraz Island essentially operates as a national park. You can spend a full day hiking, taking in the view from multiple observation points and appreciating the natural beauty.

This steep and winding street is the most photographed street in San Francisco. Tourists come to the Russian Hill to see, drive or walk down the "crookedest street in the world," that has in total eight hairpin turns. The Hyde Street Cable Car makes a stop at the top of Lombard Street. From there, you can get amazing views of the Fisherman’s Wharf and the Bay.