{"version":"1.0","provider_name":"Ferrovial","provider_url":"https:\/\/www.ferrovial.com\/blog\/en\/","author_name":"Tania Alonso","author_url":"https:\/\/www.ferrovial.com\/blog\/en\/author\/taniaalonsocascallana\/","title":"What are catacombs and what were they for? - Ferrovial's blog","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"8z0qxxl8Zq\"><a href=\"https:\/\/www.ferrovial.com\/blog\/en\/2024\/02\/what-are-catacombs-and-what-were-they-for\/\">The world underground: what are catacombs and what were they for?<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/www.ferrovial.com\/blog\/en\/2024\/02\/what-are-catacombs-and-what-were-they-for\/embed\/#?secret=8z0qxxl8Zq\" width=\"600\" height=\"338\" title=\"&#8220;The world underground: what are catacombs and what were they for?&#8221; &#8212; Ferrovial\" data-secret=\"8z0qxxl8Zq\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script type=\"text\/javascript\">\n\/* <![CDATA[ *\/\n\/*! This file is auto-generated *\/\n!function(d,l){\"use strict\";l.querySelector&&d.addEventListener&&\"undefined\"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),o=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),c=new RegExp(\"^https?:$\",\"i\"),i=0;i<o.length;i++)o[i].style.display=\"none\";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute(\"style\"),\"height\"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):\"link\"===t.message&&(r=new URL(s.getAttribute(\"src\")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",function(){for(var e,t,s=l.querySelectorAll(\"iframe.wp-embedded-content\"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute(\"data-secret\"))||(t=Math.random().toString(36).substring(2,12),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t)),e.contentWindow.postMessage({message:\"ready\",secret:t},\"*\")},!1)))}(window,document);\n\/* ]]> *\/\n<\/script>\n","thumbnail_url":"https:\/\/static.ferrovial.com\/wp-content\/uploads\/sites\/3\/2024\/02\/22063146\/el-mundo-bajo-el-suelo-que-son-y-para-que-se-usaron-las-catacumbas.jpg","thumbnail_width":1383,"thumbnail_height":2048,"description":"Why were the catacombs excavated and why was it decided to bury the dead in long tunnels underground? To understand this, it is necessary to travel back to Rome in the 2nd century AD."}