Communication via stones and rocks

Ancient cultures used both natural and man made rocks and stones for building up practical and cultural buildings, different formations with questionable functions, carvings for indicating events or marking locations, and for supporting the communication between people and people, as well as people and gods. 

Types of stone formations, their names and functions are  introduced and discussed in a series of  websites, Wikipedia itself has a wide range of collection from geoglyphs, petroglyphs, dolmens, etc. We enlisted some interesting and important links in this topic.

Aboriginal stone arrangements: Australia

Archaeoastronomy

Archaeoastronomical sites sorted by country

Astronomical chronology

Australian Aboriginal Astronomy Project

Burial mounds in the United States

Canada's Stonehenge

Cultural astronomy

Cursus monument

Dolmen

Earth mysteries

European Megalithic Culture

Geoglyphs

Inukshuk

Kunhalom (burial mound or tumulus in Hungarian): http://hu.wikipedia.org/wiki/Kunhalom

Kunhalom: aerial photos

Ley lines: http://en.wikipedia.org/wiki/Ley_line

Ley tunnel

List of archaeoastronomical sites sorted by country: ősi csillagászati építmények és alkotások országonként bemutatva

List of artefacts of archaeoastronomical significance: si csillagászati maradványok

Lunar standstill

Markawasi: http://www.robertschoch.net/Mystery%20of%20Markawasi.htm, http://www.labyrinthina.com/schneider.htm,

Medicine Wheels: gyógyító kerék

Mound builders: bucka (halom) építők

Nazca lines: http://en.wikipedia.org/wiki/Nazca_Lines, http://www.v-j-enterprises.com/peruart.html,

Neolithic Subpluvial

Original Keetoowah Society

Petroforms

Petrosomatoglyph

Psychogeography

Puebloan peoples

Rock art: http://en.wikipedia.org/wiki/Rock_Art

Sandpainting

Serpent Mound

Songlines

Southeastern Ceremonial Complex

Telluric currents

Temenos

Tumulus moulds and burrows in Europe and Asia

Water glyphs: http://www.waterglyphs.org/; http://www.wildernessutah.com/learn/waterglyphs.html