{"version":"1.0","provider_name":"Burgruine &amp; Fluweelengrotte","provider_url":"https:\/\/www.kasteelvalkenburg.nl\/de\/","author_name":"James Robinson","author_url":"https:\/\/www.kasteelvalkenburg.nl\/de\/author\/james-robinson\/","title":"Fluweelengrotte - Burgruine &amp; Fluweelengrotte","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"mA4JaycHyy\"><a href=\"https:\/\/www.kasteelvalkenburg.nl\/de\/entdeck-unsere-standorte\/fluweelengrotte\/\">Fluweelengrotte<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/www.kasteelvalkenburg.nl\/de\/entdeck-unsere-standorte\/fluweelengrotte\/embed\/#?secret=mA4JaycHyy\" width=\"600\" height=\"338\" title=\"&#8222;Fluweelengrotte&#8220; &#8211; Burgruine &amp; Fluweelengrotte\" data-secret=\"mA4JaycHyy\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script>\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\/\/# sourceURL=https:\/\/www.kasteelvalkenburg.nl\/wp-includes\/js\/wp-embed.min.js\n<\/script>\n","thumbnail_url":"https:\/\/www.kasteelvalkenburg.nl\/wp-content\/uploads\/2020\/03\/Kasteelgrot-Fluweelengrot_Rondleiding-over-ons.jpg","thumbnail_width":1440,"thumbnail_height":662,"description":"Labyrinth durch Mergelabbau Damals wurde n\u00e4mlich Mergel von den so genannten \u201aBlokbrekers\u2018 (Bl\u00f6ckebrechern) in der H\u00f6hle abgebaut, den man als Baumaterial f\u00fcr unter anderem Burg Valkenburg ben\u00f6tigte. In der Folge dieses Mergelabbaus bildete sich ein ausgedehntes Labyrinth aus uralten, bizarren G\u00e4ngen. Tickets Fluchtg\u00e4nge Die erst im Jahr 1937 entdeckten geheimen Fluchtg\u00e4nge erm\u00f6glichten es Rittern und [&hellip;]"}