Prague is compact enough that crowds rather than distance are the constraint, and the difference between a good visit and a frustrating one is mostly timing. What three days covers, why the castle takes longer than expected, and the exchange booth trap that costs visitors real money.
Florence is small enough to walk end to end, so the constraint is not distance but the time its two defining museums take. How three days break down, the late afternoon Uffizi ticket that changes the plan, and when Florence stops being a destination and becomes a base.
Barcelona is larger than visitors expect and the Gaudi sites are scattered across it, which is why four days works where three feels brisk. How the days divide by district, what the doubled 2026 tourist tax now costs per night, and why booking slots should come before booking flights.
Barcelona is safe in the way that matters most, since violent crime against visitors is rare. What it has instead is one of Europe's highest pickpocketing rates, concentrated in a small number of predictable places. Which areas need care, which do not, and the habits that remove most of the risk.
What the TSA and FAA actually allow when you fly with a lighter: which types clear the checkpoint, why torch and jet flame lighters are banned outright, when a fuelled lighter may go in the hold, and how the rules shift once you leave the United States.
Two changes since 2025 narrowed the gap between the PreCheck lane and the standard one, which most articles on this subject predate. What the programme costs, what you still get that others do not, who should buy Global Entry instead, and the setup mistake that makes memberships appear not to work.
London is the cheapest major European capital to spend a day in, because the national museums charge no admission and the parks are enormous. Thirty free things grouped by area rather than by type, the handful that need booking weeks ahead, and where the money actually goes instead.
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