May pole

A maypole is a tall wooden pole erected as a part of various European folk festivals, around which a maypole dance often takes place.

The festivals may occur on May Day (May 1st) or Pentecost (Whitsun), although in some countries it is instead erected at Midsummer. In some cases the maypole is a permanent feature that is only utilised during the festival, although in other cases it is erected specifically for the purpose before being taken down again.

Primarily found within the nations of Germanic Europe and the neighbouring areas which they have influenced, its origins remain unknown, although it has been speculated that it originally had some importance in the Germanic paganism of Iron Age and early Medieval cultures, and that the tradition survived Christianisation, albeit losing any original meaning that it had. It has been a recorded practice in many parts of Europe throughout the Medieval and Early Modern periods, although it became less popular in the 18th and 19th centuries. Today, the tradition is still observed in some parts of Europe and among European communities in North America.

The symbolism of the maypole has been continuously debated by folklorists for centuries, although no definitive answer has been found. Some scholars classify maypoles as symbols of the world axis (axis mundi). The fact that they were found primarily in areas of Germanic Europe, where, prior to Christianisation, Germanic paganism was followed in various forms, has led to speculation that the maypoles were in some way a continuation of a Germanic pagan tradition. One theory holds that they were a remnant of the Germanic reverence for sacred trees, as there is evidence for various sacred trees and wooden pillars that were venerated by the pagans across much of Germanic Europe, including Thor's Oak and the Irminsul. It is also known that, in Norse paganism, cosmological views held that the universe was a world tree, known as Yggdrasil. There is therefore speculation that the maypole was in some way a continuance of this tradition.

...
Wikipedia