Obscurasky – Own work, CC BY-SA 4.0, Link
An insect hotel is a man made structure created to provide shelter for insects. They can come in a variety of shapes and sizes depending on the specific purpose or specific insect it is catered to. Most consist of several different sections that provide insects with nesting facilities – particularly during winter, offering shelter or refuge for many types of insects. Their purposes include hosting pollinators.
Many insect hotels are used as nest sites by insects including solitary bees and solitary wasps. These insects drag prey to the nest where an egg is deposited. Other insects hotels are specifically designed to allow the insects to hibernate, notable examples include ladybugs and butterflies.
Good materials to build insect hotels with can include using dry stone walls or old tiles. Drilled holes in the hotel materials also encourage insects to leave larvae to gestate.
info wikipedia
Ladybird hotel – Sb2s3 [CC BY-SA 4.0], via Wikimedia Commons
Bee hotel and Insect hotel in La CasaRoja Farm, Asturias, Spain. – By Cadv19 – Own work, CC BY-SA 4.0, Link</a
Insect house in Pontgibaud, Puy-de-Dôme, France – By Père Igor – Own work, CC BY-SA 3.0, Link
By Hans-Jörg Hellwig – Own work, CC BY-SA 3.0, Link
By Tony Hisgett from Birmingham, UK – Insect HotelUploaded by Magnus Manske, CC BY 2.0, Link
gailhampshire from Cradley, Malvern, U.K [CC BY 2.0], via Wikimedia Commons
By Gareth E Kegg – Own work, CC BY-SA 3.0, Link
e MORFES 
Wonderful.