Undoubtedly THE major work of renowned architect, Gaudi, the Sagrada Familia (Church of the Sacred Family) is a magnificent and unique architectural structure, prompting many critics to pronounce it the only church like it in the world. Almost as famous as the church itself is how long they've been building the place. Only about a quarter completed as of Gaudi's death, this iconic landmark is still unfinished to this day, although 2026 is the current targeted date. If that does end up being the case, the Sagrada Familia will have taken an incredible 144 years to complete.
The most significant external feature is its eight large spires, although some would say that the cranes and other facets of ongoing construction vie for this distinction. Entrance is about $12 USD and it is about $2 more to take the elevator to the top of one of the towers, which will present you with quite the view of Barcelona.
If you aren't into spending the money and waiting in agonizingly long lines, you may enjoy this symbol of Barcelona's best side, the outside, for free.
Note:The Church of the Sacred Family is located on Carrer de Mallorca.