December 10, 2015 3:37 PM EST

Airbnb is to hotels as Uber is to taxis. An accommodations-booking platform with more than 2 million listings worldwide, Airbnb lets users rent out their unused space to travelers. It’s also known for its offbeat accommodations, like lighthouses and castles.

However, the site is not without controversy: Some critics argue Airbnb lets property owners run de-facto hotels in apartments intended for long-term housing, driving up real estate prices in some cities.

For more about Airbnb, watch the Tech Time video above.

Write to Alex Fitzpatrick at alex.fitzpatrick@time.com and Arpita Aneja at arpita.aneja@time.com.

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