Even if a person returns after a month, they should write a guide. Not much, but I will answer any questions [Praise R]
List of anti-theft items to prepare:
“8” shaped lock (for backpacks or crossbody bags)
Anti-theft waist pack/anti-theft leggings (for passports and important valuables)
Door stopper (for hotels)
Long steel wire combination lock (for trains)
10-day itinerary:
Day 1: Shanghai 
Madrid
Day 2: Madrid
Day 3: Madrid 
Cordoba
Day 4: Cordoba Seville
Day 5: Seville Granada
Day 6: Granada Valencia
Day 7: Valencia Barcelona
Day 8: Barcelona
Day 9: Barcelona 
Madrid Shanghai
Tips: According to this itinerary, the pace is well-balanced. Cordoba and Valencia serve as rest stops on the travel loop. If you are tired, you can take a break and visit fewer attractions. If time permits, it is recommended to spend an extra day in Seville. This city is worth experiencing the unique leisure of the south in its old streets [Winking R]
Hotel Accommodation:
Madrid
HOTEL RIU PLAZA ESPAÑA
Cordoba
Hotel Córdoba Center
Seville
HOTEL GIRALDA CENTER
Granada
Barceló Carmen Granada
Valencia
ILUNION Aqua 4
Barcelona
Hotel Royal Passeig de Gràcia
Tips: The pictures record the hotel addresses. Except for the hotel in Cordoba, which I would not consider staying at again, the others can be used as references.
Unforgettable Attractions:
Madrid · Retiro Park, Prado Museum
Seville · Plaza de España, Cathedral, Flamenco Show
Granada · Alhambra!! 
Barcelona · Sagrada Familia > Casa Batlló > Casa Milà
Tax Refund at Madrid T1:
They did not give me 
. The reason they gave was that Global Exchange and Global Blue are two different companies, and GE also needs to make money [Embarrassed R]. I argued but didn’t win, so I gave up…
Overall, this trip went quite smoothly. I started praying before leaving, and not encountering thieves was our greatest blessing [Laughing R]. Always be vigilant, and never leave valuables in the car. The weather in mid-to-late May was really great, neither too cold nor too hot, with blue skies and white clouds, like admiring oil paintings outdoors. The flowers in the parks were in full bloom, and everything was just right 
