Gate 1 Travel just launched a massive summer sale on more than 800 vacations worldwide for travel through 2020. This Travelzoo-exclusive offer is available through 11:59 p.m. ET on Tuesday, June 25.

We love the breadth of this sale -- from escorted tours and river cruises, to independent city stays and fly-and-drive trips, to luxury and small-group Discovery packages.

How it works: The more you spend, the more you save on already-low prices. Get $150 off when you spend a total of $1000 or more, $350 off $2500 or more, $600 off $5000 or more, $1000 off $7500 or more, $1500 off $10,000 and $2500 off $15,000 or more.

Here are some of our favorite itineraries (prices listed per person, including flights):

• Madrid and Barcelona 6-night city break ... $799 for Travelzoo members (reg. $869)
• Rome, Florence, Venice at your own pace, including train between cities ... $1064 (reg. $1139)
• Croatia and Slovenia upscale guided tour through six cities ... $1594 (reg. $1769)
• Japan tour of Tokyo, Osaka and Kyoto with bullet train  ...  $2549 (reg. $2849)
• South Africa 12-night trip including Cape Town, safari and Victoria Falls ... $3769 (reg. $4269)
• Brazil, Argentina and Peru 16-night adventure with Rio and Iguazu Falls ... $4309 (reg. $5059)

To unlock the private promo codes for this sale on Gate 1's website, click the blue button below.

For 16 years, Gate 1 Travel has been a Travelzoo-member favorite for its high-quality vacations.