Of the 30 places the UK Telegraph says one must visit in Europe, I have seen 17:
Charles Bridge, Prague, Czech Republic; Gaudi’s Barcelona; Sistene Chapel, Italy; Acropolis, Greece; Aya Sofia, Istanbul; Blue Mosque, Istanbul; Sainte Chapelle, Paris; Red Square, Moscow; Brandenberg Gate, Germany; Colosseum, Rome, Italy; Ephesus, Turkey; Eiffel Tower, Paris; Alhambra, Spain; Pantheon, Rome, Italy; Versailles, Paris, France; Hermitage, St. Petersburg; Pompeii, Italy.
13 places I haven’t seen: Provence, France; Pamukkale, Turkey; Seville, Spain; Matterhorn, Switzerland; Loire Valley, France; Atlantic Road, Norway; Northern Lights, Scandinavia or Iceland; Leaning Tower of Pisa, Italy; Tuscany, Italy; Lake Bled, Slovenia; Venice, Italy; black beaches of Iceland; Cordoba, Spain.
Compare this to the 20 places in Europe you must see in Europe before you die. It’s a very different list, and I haven’t seen most of them, only four.